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Chemistry 102
April 2024
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Chemistry 102
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April 12, 2024
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April 12 of 2024
Calculate the solubility at 25 °C of AgCl in pure water and in a 0.0180M AgNO3 solution. You'll find Ksp data in the ALEKS Data tab. Round both of your answers to 2 significant digits. solubility in pure water: g/L solubility in 0.0180 M AgNO3 solution: g/L
Se construye una cabaña en una colina y propone el sistema hidráulico mostrado en la figura. El tanque de distribución en la cabaña mantiene una presión de 30 psig sobre el agua. En la tubería hay una pérdida de energía de 15.5 lb-pie/lb. a) Calcule la potencia (en HP) que la bomba transmite…
Acids and Bases Calculating the \( \mathrm{pH} \) at equivalence of a titration \( 0 / 5 \) A chemist titrates \( 250.0 \mathrm{~mL} \) of a \( 0.7308 \mathrm{M} \) propionic acid \( \left(\mathrm{HC}_{2} \mathrm{H}_{5} \mathrm{CO}_{2}\right) \) solution with \( 0.5224 \mathrm{MNaOH} \)…
Without doing any calculations, match the following thermodynamic properties with their appropriate numerical sign for the following exothermic reaction. \[ 2 \mathrm{NO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{NO}_{2}(\mathrm{~g}) \] Clear All
Consider the reaction \[ \mathrm{CO}(\mathrm{g})+\mathrm{Cl}_{2}(\mathrm{~g}) \longrightarrow \mathrm{COCl}_{2}(\mathrm{~g}) \] Use the standard thermodynamic data in the tables linked above. Calculate \( \Delta G \) for this reaction at \( 298.15 \mathrm{~K} \) if the pressure of \( \mathbf{C…
Please solve these 2 pages. Show steps. Thank you
The equilibrium constant, \( \mathrm{K}_{\mathrm{p}} \), for the following reaction is \( 1.04 \times 10^{-2} \) at \( 548 \mathrm{~K} \). \[ \mathrm{NH}_{4} \mathrm{Cl}(\mathrm{s}) \rightleftharpoons \mathrm{NH}_{3}(\mathrm{~g})+\mathrm{HCl}(\mathrm{g}) \] If \( \Delta H^{\circ} \) for this…
\[ 2 \mathrm{NO}(\mathrm{g})+\mathrm{Br}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NOBr}(\mathrm{g}) \] If \( \Delta H^{\circ} \) for this reaction is \( \mathbf{- 1 6 . 1} \mathrm{kJ} \), what is the value of \( \mathrm{K}_{\mathrm{p}} \) at \( \mathbf{1 7 7} \mathrm{K} \)…
The equilibrium constant, \( K_{p} \), for the following reaction is \( \mathbf{0 . 6 3 6} \) at \( 600 \mathrm{~K} \). \[ \mathrm{COCl}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{CO}_{(\mathrm{g})}+\mathrm{Cl}_{2}(\mathrm{~g}) \] If \( \Delta H^{\circ} \) for this reaction is \( 108…
Please solve these 2 pages showing steps.
For the reaction \[ \begin{array}{l} 2 \mathrm{BrF}_{3}(\mathrm{~g}) \longrightarrow \mathrm{Br}_{2}(\mathrm{~g})+3 \mathrm{~F}_{2}(\mathrm{~g}) \\ \Delta \mathrm{H}^{\circ}=542 \mathrm{~kJ} \text { and } \Delta \mathrm{S}^{\circ}=269 \mathrm{~J} / \mathrm{K} \end{array} \] The equilibrium…
For the reaction \[ \begin{array}{l} 2 \mathrm{NH}_{3}(\mathrm{~g})+2 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{N}_{2} \mathrm{O}(\mathrm{g})+3 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \\ \Delta \mathrm{H}^{\circ}=-683 \mathrm{~kJ} \text { and } \Delta \mathrm{S}^{\circ}=-366 \mathrm{~J}…
For the reaction \[ \begin{array}{l} 3 \mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{~s})+\mathrm{H}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{Fe}_{3} \mathrm{O}_{4}(\mathrm{~s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \\ \Delta \mathrm{H}^{0}=-6.0 \mathrm{~kJ} \text { and } \Delta \mathrm{S}^{0}=88.7…
For the reaction \( \mathrm{C} \) (s,graphite) \( +\mathrm{O}_{2}(\mathrm{~g}) \longrightarrow \mathrm{CO}_{2}(\mathrm{~g}) \) \( \Delta G^{\circ}=-394.5 \mathrm{KJ} \) and \( \Delta S^{\circ}=2.9 \mathrm{~J} / \mathrm{K} \) at \( 332 \mathrm{~K} \) and \( 1 \mathrm{~atm} \). The maximum amount…
Consider the reaction \[ 2 \mathrm{C}_{2} \mathrm{H}_{6}(g)+7 \mathrm{O}_{2}(g) \rightarrow 4 \mathrm{CO}_{2}(g)+6 \mathrm{H}_{2} \mathrm{O}(g) \] for which \( \Delta H^{\circ}=-2855 \mathrm{~kJ} \) and \( \Delta S^{\circ}=92.70 \mathrm{~J} / \mathrm{K} \) at \( 298.15 \mathrm{~K} \). 1.…
What is the pH of a buffer solution that is 0.34 M in Na2HPO4 and 0.46 M in KH2PO4? For ‒3 ‒8 ‒13 H3PO4. Ka1 = 7.1×10 , Ka2 = 6.3×10 , and Ka3 = 4.5×10 .
Consider the reaction \[ 2 \mathrm{H}_{2} \mathrm{~S}(\mathrm{~g})+3 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+2 \mathrm{SO}_{2}(\mathrm{~g}) \] for which \( \Delta H^{\circ}=-\mathbf{1 . 1 2 4} \times 10^{3} \mathrm{~kJ} \) and \( \Delta…
Be sure to label each of your reasons by type by using a single letter in parentheses after the statement. - Observations (0): These are patterns or trends you see in your experiment evidence. - Science Facts (F): These are general scientific principles, theories or models that provide…
Consider the reaction \[ \mathrm{H}_{2}(\mathrm{~g})+\mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{~g}) \longrightarrow \mathrm{C}_{2} \mathrm{H}_{6}(\mathrm{~g}) \] Using standard thermodynamic data at \( 298 \mathrm{~K} \), calculate the entropy change for the surroundings when 2.44 moles of \(…
Por un tubo de cobre recto de 2 pulgadas tipo K, fluye glicerina a 25 grados centígrados, a una razón de 250 litros/min. Calcule: a) El Número de Reynolds. b) El valor del coeficiente de fricción. c) La diferencia de presión entre dos puntos separados por 30 m , si el primer punto está a…
The utilisation of carbon or Hydrocarbons with co-electrolysis of water has been proposed as a valuable option for Hydrogen production. Calculate the expansion work done when 30 g of carbon is electrolysed under constant pressure at 500°C give your answer in Joule.
Which of the following comments are appropriate when referring to the results of the tensile testing for the oil-quenched and water-quenched specimens? Choose any comments that you believe to be correct.
Solve
Which of the following is true about a galvanic cell? A) It converts electrical energy into chemical energy B) It converts chemical energy into electrical energy C) It does not involve redox reactions D) It requires an external source of electricity to operate
Chapter 9 - Acids, Bases, and Salts 1. Acids in Water 2. Bases in Water 3. Write Conjugate Formulas 4. Brønsted Acids and Bases 5. Identify Conjugate Pairs in React... 6. Acid Nomenclature: Binary 7. Acid Nomenclature: Polyatomic 8. Monoprotic and Polyprotic Acids 9. pH and Acidity 10.…
Examen 2 propiedades de solucion UIV FAJARDO UNIVERSIDAD INTERAMERICANA DE PUERTO RICO RECINTO DE FAJARDO Departamento de Ciencias y Tecnología Ejercicios de practica: Propiedades de las soluciones I. Lea cuidadosamente cada pregunta y conteste en el espacio provisto. Demuestre los cálculos…
The balanced equation for a given reaction is ( 4 X+3 Y ightarrow P ). The following data regarding initial reaction rates were collected in the lab. What is the rate law for the reaction? egin{tabular}{|l|l|l|l|} hline Trial & ( [X](M) ) & ( [Y](M) ) & Rate ( (M / s) ) \ hline 1 & 0.020 &…
A chemist titrates 170.0 mL of a 0.7322 M pyridine (C5H5N) solution with 0.2393 M HCl solution at 25 °C. Calculate the pH at equivalence. The pKb of pyridine is 8.77. Round your answer to 2 decimal places. Note for advanced students: you may assume the total volume of the solution equals the…
An analytical chemist is titrating 114.0 mL of a 0.5300M solution of benzoic acid (HC6H5CO2) with a 0.5600M solution of NaOH. The pKa of benzoic acid is 4.20 Calculate the pH of the acid solution after the chemist has added 117.7 mL of the NaOH solution to it. Note for advanced students: you…
Calculate the solubility at 25 °C of CuBr in pure water and in a 0.0030 M CoBr2 solution. You'll find Ksp data in the ALEKS Data tab. Round both of your answers to 2 significant digits. solubility in pure water: ? g/L solubility in 0.0030 M CoBr2 solution: ? g/L
e) If 10.0 mL 0.0510 M KMnO4 is required to titrate a 0.254 g impure sample of Na2C204, what is the percent C204* in this sample? t) What is the percent purity of the complex in part e?
If 10.0 mL 0.0510 M KMnO4 is required to titrate a 0.254 g impure sample of Na2C204, what is the percent C204* in this sample?
the steps of this chimical reaction
Suppose that a weak acid has a Ka of 2.5 x 10^-5. Calculate and enter its pKa below. Note. A pKa for a weak acid in an aqueous solution should be in the range of 1 to 7.
Considering the Data Table A and correct amounts from Q1 - Q4, if an antacid tablet weighed 1.6 grams, how many moles of gastric acid (HCl) would it neutralize? Question 5 options: 0.0031 0.0019 0.11 0.071
The reaction that occurred when the antacid mixed with the HCl resulted in an additional product (besides a salt and water). What is the name of the additional compound formed? Oxygen Hydrogen Carbon monoxide Carbon dioxide
It is important to perform multiple trials to show that the experimental results are reproducible. True or false?
What is the amount of HCl, in grams, neutralized per gram of antacid.
Based on the amount of HCl available for neutralization (Question 1) and the moles of NaOH required to reach the stoichiometric point (Question 2), determine the amount of HCl neutralized by the antacid in grams. Neutralization: 0.24 Stoichiometric point: 0.0065
Consider Data Table A below and determine the moles of NaOH required to reach the stoichiometric point.
Consider Data Table A below and determine the mass, in grams, of HCl available for neutralization.
Enter the absolute value of the change in pH caused by the addition of 1.0 mL of 0.10 M NaOH to each of the solutions. pH of H2O + NaOH: 11.59 pH WA + NaOH: 3.96 pH CB + NaOH: 11.44 pH Buffer + NaOH: 4.90 pH
The solubility-product constant, Ksp = 1.78 x 10-10 at 25°C for the following reaction. Calculate ΔG (kJ/mol) at 25°C if a solution is 0.00153 M in Ag+(aq) and 0.03989 M Cl-(aq)? Give the value of the free energy change rounded to the tenth of kJ/mol. Do not include units. Use constants from…
63 points For a particular process, if the change in enthalpy is \( 177.8 \mathrm{~kJ} / \mathrm{mol} \) and the change in entropy is \( 160.5 \mathrm{~J} / \mathrm{molK} \) at \( 25.00^{\circ} \mathrm{C} \), what is the change in free energy, in kilojoules per mole? Your answer should be…
1.1 Define the Helmholtz energy \( A \). [1] 1.2 Give the formulas for the first and second laws of thermodynamics. \( [2] \) 1.3 Derive an equation for \( H \) in terms of pressure, volume and temperature. [3]
Use Hess's Law to calculate \( \Delta G^{\circ}{ }_{r \times n} \) using the following information: \[ \begin{array}{cl} \mathrm{ClO}(g)+\mathrm{O}_{3}(g) \rightarrow \mathrm{Cl}(g)+2 \mathrm{O}_{2}(g) & \Delta \mathrm{G}^{\circ}{ }_{\mathrm{rxn}}=? \\ 2 \mathrm{O}_{3}(g) \rightarrow 3…
An acetic acid buffer solution is required to have a pH of 5.27. You have a solution that contains 0.01 mol of acetic acid. What is the molarity of sodium acetate will you need to add to the solution? The pKa of acetic acid is 4.74. Note: report answer in decimal form with correct sig figs and…
path functions and not state functions. Q4(b) [7.5 Marks] (i) Predict which substance in each of the following pairs has the higher entropy at \( 298 \mathrm{~K} \) and justify your answer. \( 1 \mathrm{~mol} \) of \( \mathrm{C}(\mathrm{s}) \) OR \( 1 \mathrm{~mol} \) of \(…
Q4(a) [12.5 Marks] For ethanol, \( \Delta \mathrm{vapH}^{0}=43.5 \mathrm{~kJ} \mathrm{~mol}^{-1} \). (i) Calculate q, w, \( \Delta \mathrm{H} \) and \( \Delta \mathrm{U} \) when \( 1.75 \mathrm{~mol}_{2} \mathrm{H}_{5} \mathrm{OH}(\mathrm{I}) \) is vaporised at \( 260 \mathrm{~K} \) at constant…
Determine the correct neutralization reaction that occurs when HCl and NaOH are added to the buffer system that you investigated. Question 5 options: a) CH3COO-(aq) + H3O+(aq)→CH3COOH(aq) + H2O(l) b) CH3COOH(aq) + OH-(aq)→CH3COO-(aq) + H2O(l) c) HCl(aq) + CH3COO-(aq) →…
Sketch the Lewis structure and name the molecular VSEPR shape for oxygen difluoride, F2O.
(iii) an adiabatic reversible expansion. Q3(b) [15 Marks] (i) Using the information given, calculate the standard enthalpy of the combustion of acetaldehyde using the enthalpy of formation method. | Formation reactions | ?Hf° (kJ mol?¹) | | :--- | :--- | | 2C(s) + 2H?(g) + ½O?(g) ? CH?CHO(l)…
True or false? Buffers act most effectively when [HA+] and [A-] are equal.
QUESTION 3 [TOTAL MARKS: 25] Q3(a) [10 Marks] Calculate the change in entropies of the system, \( \Delta \mathrm{S}_{\text {sys }} \), and the surroundings, \( \Delta \mathrm{S}_{\text {sur }} \) and the total change in entropy, \( \Delta \mathrm{S}_{\mathrm{tot}} \), when the volume of a…
True or false? The concentration of a weak acid will be equal to the concentration of the hydronium ion, H3O+, at equilibrium.
QUESTION 2 Answer both parts [TOTAL MARKS: 25] Q2(a) [8 Marks] For the reaction \( \mathrm{A} \xrightarrow{k 1} \mathrm{~B} \xrightarrow{k 2} \mathrm{C} \), draw two sketches showing how the concentrations of \( A, B \) and \( C \) will change during the course of the reaction if (i) \( k_{1}…
True or false? The buffer capacity is the pH range where a buffer effectively neutralizes added acids and bases, while maintaining a relatively constant pH.
An electronics company wants to fit a solvent recovery system on the vent gas from its circuit board manufacturing line. The solvent recovery system consists of a chiller, a knockout drum, and an adsorbent bed. The adsorbent is periodically regenerated by circulating hot air over the bed and to…
Which has the higher electronegativity, an atom with atomic number 13 or an atom with atomic number 27? Justify your answer (including if you can't tell which one is more electronegative).
1) The following equation is the conversion of acetyl-coenzyme A to acetic acid by hydrolysis is CH3CO-S-CoA + H2O <-->CH3COOH + HS-CoA (1) Now, first balance the following decarboxylation of acetic acid to carbon-di-oxide. CH3COOH<--> CO2 (2) Find out by balancing the above reaction the…
An unknown gas was tested to find the molar mass: a glass bulb with a volume of 125.00 mL was evacuated (all the air was pumped out) and weighed. gas-sampling-tube-with-stopcocks-laboratory-125-ml-22292.png The bulb was then filled with the unknown gas up to a pressure of 891 torr and weighed…
Sugar Standard Curve II (Lab Session): Calculating %Sugar from Nutrition Facts Introduction Overview Finding the %sugar of Your Standards Calculating Standard Densities Finding the %Sugar of Your Beverage Using Excel to analyze experimental results Calculating %Sugar from Nutrition…
pls help
You Consider the following reaction at \( 298 \mathrm{~K} \). \[ \begin{array}{l} \mathrm{H}^{+}(a q)+\mathrm{Fe}^{2+}(a q) \rightarrow \mathrm{H}_{2}(g)+\mathrm{Fe}^{3+}(a q) \\ \begin{array}{|l|l|} \hline \mathrm{H}^{+}(a q)+2 e^{-} \rightarrow \mathrm{H}_{2}(g) & E_{\text {red }}^{o}=0.000…
4 4 rons.yoz. Fort: iJricts. -its. 'riswat \( +1+1+1 \). \( =\mathrm{i}^{+} \) \&045 :4. c+e Froift
Calculate the pH of the solution formed when 10.0 mL of 0.200 M NaOH is added to 30.0 mL of 0.100 M of benzoic acid, C6H5COOH. 9.499 4.501 4.200 1.301 1.602
What must be true of a spontaneous process? Enthalpy must increase. B There will be a flow of heat. C Entropy of the universe increases. D Entropy of the system increases. E Entropy of the surroundings increases.
thoughtful mini- Good运用系统内置的清洗规则，此文本仅包含题目内容及选项，无任何冗余页面元素、OCR错误
I need this question done with the irreducible representattions of each molecule with the point groups I put high emphasis on doing out the calculations on how you got the irreducible representations thank you.
20) Please fill in the blanks given below with appropriate words or phrases. (5P) a) A ________ is a polyatomic ion composed of a central metal ion bonded to two or more molecules or ions called ligands. b) Solutions that resist changes in pH upon the addition of small amounts of an acid or…
18) In the qualitative cation analysis procedure, Bi3+ is detected by the appearance of a white precipitate of bismuthyl hydroxide, BiOOH(s). Please calculate the pH of a saturated aqueous solution of BiOOH. (5P) BiOOH(s) ? BiO+(aq) + OH-(aq) Ksp = 4 × 10^-10
17) Which of the following solids is (are) more soluble in a basic solution than in pure water? (5P) a) BaSO4 b) H2C2O4 c) Fe(OH)3 d) NaNO3 e) MnS
16) Please arrange the following \( 0.010 \mathrm{M} \) solutions in order of increasing \( \mathrm{pH}: \mathrm{NH}_{3}(\mathrm{aq}) \), \( \mathrm{HNO}_{3}(\mathrm{aq}), \mathrm{NaNO}_{2}(\mathrm{aq}), \mathrm{CH}_{3} \mathrm{COOH}(\mathrm{aq}), \mathrm{NaOH}(\mathrm{aq}), \mathrm{NH}_{4}…
15) The sketch on the far left represents the ( left[mathrm{H}_{3} mathrm{O}^{+} ight] ) present in an acetic acid solution of molarity M. If the molarity of the solution is doubled, which of the sketches below best represents the resulting solution? (5P)
What a net ionic equation that occurs in a Na2HPO4/NaH2PO4 buffer solution when a small amount of HCl is added HPO42- (aq) + H2O(l) H2PO4-(aq) + H3O+(aq) HPO42- (aq) + H2O(l) H2PO4-(aq) + OH-(aq) H2PO4-(aq) + OH-(aq) HPO42- (aq) + H2O(l) HPO42- (aq) + H3O+(aq) …
14) According to the Bronsted-Lowry theory, which one or ones of the following are acids. (5P) a) HNO2 b) OCl-1 c) NH2-1 d) NH4+ e) CH3NH3+
Using the decay reaction A ? B as an example, sketch how [A] would change with time during the reaction, if the decay process was (i) zero order, (ii) first order, (iii) second order. Explain the significance of the order of reaction and mechanism of reaction.
What is the effective pH range for a CH3COONa / CH3COOH buffer? Ka = 1.8 x 10-5 5.74 3.74 - 4.74 4.74 3.74 - 5.74 3.74
Over what range of pH is a HOCl - NaOCl buffer effective? Ka = 3.5 x 10-8 8.46 6.46 - 8.46 7.46 7.46 - 8.46 6.46 - 7.46
Which of the following mixtures is suitable for making a buffer solution with the optimum pH of 9.2-9.3? The Ka values are given. HCOOH / HCOO- - 1.8 x 10-4 C5H5N/ C5H5NH+ - 6.7 x 10-6 NO2- / HNO2 - 4.5 x 10-4 NH3 / NH4+ - 5.6x 10-10 HCN / CN- - 4.0 x 10-10
13) *A solution is prepared having these initial concentrations: ( left[mathrm{Fe}^{3+} ight]=left[mathrm{Hg}_{2}{ }^{2+} ight]=0.5000 ) ( mathrm{M} ;left[mathrm{Fe}^{2+} ight]=left[mathrm{Hg}^{2+} ight]=0.03000 mathrm{M} ). The following reaction occurs among the ions at 25 ( { }^{circ}…
11) For which of the following reaction or reactions would you expect the extent of the forward reaction to increase with increasing temperatures? (5P) (a) $PCl_5(g) ightleftharpoons PCl_3(g) + Cl_2(g)$ $Delta H^o = +92.5 ext{ kJ}$ (b) $SO_3(g) ightleftharpoons SO_2(g) + frac{1}{2}O_2(g)$…
10) Three different sets of data of [A] versus time given in the following table for the reaction A ? Products. Which of these sets of data corresponds to a second order reaction? (5P) a) I b) II c) III d) None | I | | II | | III | | | :--- | :--- | :--- | :--- | :--- | :--- | | Time, s |…
Which are spontaneous at high temperatures? Choose one or more: \[ \begin{array}{c} 2 \mathrm{H}_{2} \mathrm{~S}(\mathrm{~g})+3 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})+\mathrm{SO}_{2}(\mathrm{~g}) \\ \Delta \mathrm{H}_{\mathrm{rxn}}^{\circ}=-1037…
For the following reaction, predict the signs of \( \Delta H, \Delta S \), and \( \Delta G \). \[ \mathrm{I}(\mathrm{g})+\mathrm{I}(\mathrm{g}) \longrightarrow \mathrm{I}_{2}(\mathrm{~s}) \] Items (3 items) (Drag and drop into the appropriate area below) \( \Delta \mathrm{H} \) \( \Delta S…
3:07 ox 40 , 40 ?? Q 0 6 Absorbs water and nutrients left 7. Forces food from the throat into the stomach 9. Process of taking food into the mouth 14. Stores and releases bile into the small intestine B. Directions: By referring to the picture below, write the number and identify the part that…
Consider the reaction: \[ \mathrm{H}_{2}(g)+\mathrm{C}_{2} \mathrm{H}_{4}(g) \rightarrow \mathrm{C}_{2} \mathrm{H}_{6}(g) \] Using standard absolute entropies at \( 298 \mathrm{~K} \), calculate the entropy change for the system when 2.44 moles of \( \mathrm{H}_{2}(\mathrm{~g}) \) react at…
Consider the reaction: \[ 4 \mathrm{HCl}(g)+\mathrm{O}_{2}(g) \rightarrow 2 \mathrm{H}_{2} \mathrm{O}(g)+2 \mathrm{Cl}_{2}(g) \] Using standard absolute entropies at \( 298 \mathrm{~K} \), calculate the entropy change for the system when 2.17 moles of \( \mathrm{HCl}(g) \) react at standard…
Predict whether \( \Delta S \) for each reaction would be greater than zero, less than zero, or too close to zero to decide. Clear All
M1/V1=M2/V2 Make 50 ml of 10 x PBS buffer sop to make 1L NaCl 8og
Q1(a) [10 Marks] The table below shows the data obtained from a kinetics experiment for the reaction 2NO (g) + Cl? (g) ? 2 NOCl (g) by determining the initial rate of loss of NO at different reactant concentrations at 25pC: Experiment | [NO] / M | [Cl?] / M | Rate of loss of NO / Ms?¹ 1 |…
Make 50 ml of 10x lbs. buffer. Sop to make 1 l NaCl 80 g
Predict the normal boiling point of hydrogen peroxide (H2O2) from the following data: | | ?H°f, kJ/mol | ?S°, J/(mol•K) | |---|---|---| | H2O2(l) | -187.8 | 110 | | H2O2(g) | -136.3 | 233 | Part 1 (1 point) Tb = [ ] °C
6) The solutions pictured below are separated by a semipermeable membrane that permits only the passage of water molecules. In what direction a net flow of water occurs, that is from a) left to right b) right to left? Glycerol is ( mathrm{HOCH}_{2} mathrm{CH}(mathrm{OH}) mathrm{CH}_{2}…
How much heat energy is required to increase the temperature of 7 moles of each of the following gases by 50 °C? • Helium at constant volume of 5.4 L. • Argon at constant pressure of 9.0 atm. • Nitrogen at constant volume of 0.5 m3. • Carbon dioxide at constant pressure of 1.4 × 10ହ 𝑃𝑎.
4) Which one of the following substances is most water soluble? (5P) a) C10H8(s) b) NH2OH(s) c) C6H6(l) d) CaCO3(s)
3) Please rank the following substances in order of increasing surface tension at room temperature. (5 P) a) CH3OH b) CCl4 c) CH3CH2OCH2CH3
a) The temperature of a sample of pure water is \( -2^{\circ} \mathrm{C} \). Is the sample in the solid state? b) If the freezing point of a sample of water is depressed to \( -4^{\circ} \mathrm{C} \) by the add salt, in what state will the sample be at \( -2^{\circ} \mathrm{C} \) ? c) Explain…
An unknown compound contains carbon, hydrogen and oxygen. Combustion analy of the compound gives mass percents of \( 31.57 \% \mathrm{C} \) and \( 5.30 \% \mathrm{H} \). The molecular weig is determined by measuring the freezing point depression of an aqueous solution. freezing point of \(…
1) Which one of the following substances has the highest boiling point? a) ( mathrm{C}_{6} mathrm{H}_{6} ) b) ( mathrm{C}_{6} mathrm{H}_{5} mathrm{Cl} ) c) ( mathrm{C}_{6} mathrm{H}_{5} mathrm{Br} ) d) ( mathrm{C}_{6} mathrm{H}_{5} mathrm{OH} )
2,3dihydroxy-2,3diphenylbutane react with periodic acid whats the product
18. A mixture of ( 1.00 mathrm{~g} mathrm{H}_{2} ) and ( 1.06 mathrm{~g} mathrm{H}_{2} mathrm{~S} ) in a ( 0.500 mathrm{~L} ) flask comes to equilibrium at ( 1670 mathrm{~K}: 2 mathrm{H}_{2}(mathrm{~g})+mathrm{S}_{2}(mathrm{~g}) ightleftharpoons ) ( 2 mathrm{H}_{2} mathrm{~S}(mathrm{~g}) ).…
A field 4A molecular sieve adsorbent system is required to produce a gas (MW = 22) that will not condense water at 40 ℉ and 500 psia. Gas to the unit is water saturated at 110 ℉ and 300 psia, and the flow rate is 80 MMscfd. The average water loading of the adsorbent bed is 10% by weight. It is…
12:15 Vol) , ll Vol) LTE1, ?. 50 e \& Initials: Student number: Predict the products, reagents or starting material of the following reactions. ndicate the stereochemistry where relevant. 2. \( \mathrm{H}_{2} \mathrm{O}_{2},{ }^{-\mathrm{OH}} \) i. (4) (4) (4) \[ \xrightarrow[\mathrm{H}_{2}…
A B C D Which of the compounds would have exactly 4 signals in its \( { }^{1} \) H NMR spectrum? D A B C
An investor seeks to invest in apple products biorefinery. You have been hired as a consultant to advise on the design and operationalization of the proposed plant aiming to produce 2000 tonnes per annum of wine from apples a) Draw a process flow diagram for the process (5 marks) b) Draw a…
Figure 2 shows a schematic diagram of chemical treatment using bentonite. Draw design control configuration on this flowsheet. (25 marks) b) Using settling tank as the node in this process carry out HAZOP study using two primary words and two secondary words.
2.96 kg/s of a process fluid is evaporated at 444 K up to a final temperature of 478 K in a tubular unit using steam at 1720KN / (m ^ 2) Unfortunately the mode of operation permits the buildup of scale inside the tubes equivalent to a resistance of 0.00176m ^ 2 * K / W and this has to be…
draw the structure of (Z)-3-Chloro-4-isopropyl-5-methyloct-2-en-6-yne
a) Ammonia converter reactor delivered cost Ksh1.2 million. Factors for installation costs (0.4) and training (0.2) are determined. An indirect cost factor of 0.3 is applied to all direct costs. Estimate total cost. b) A 100m ^ 2 heat exchange costs Ksh3000 five years ago when the cost index…
a) Sketch a distillation column with condenser and re-boiler with all the necessary control indicated. b) State the intended purpose of a condenser and carry out HAZOP study using one primary word two secondary words
You are to specify the power a centrifugal pump to your design project. You need to pump the liquid product at 100 tons per hour from open tank one bar. Your internal pipe diameter is 200mm. The pipe has 70m straight length followed by 10 m climb high to destination tank which is at 2 bar…
manager of a company that was expanding its operations in 2004 had to install another production line to make liquid product. Some of the major equipments included; 4 floating head, shell & tube heat exchangers of fully stainless steel materials to operate at 25 bars. The approximate heat…
The liquour you are concentrating by evaporation is produced at 5kg/s coming at 300K. The steam is available saturated at 376K and its latent heat at the temperature is 2249 kJ/kg. The condensation temperature for the first effect and second effects are 359k and 325k which have their latent…
canvas.auckland.ac.nz/courses/103699/quizzes/120075/take Iester One Which structure corresponds to the NMR shown above?
Draw the four carbon bonding patterns , name the geometry and give the bond angles for each
Büşra, yeğeninin doğum günü için boyutları 48 \( \mathrm{cm} \) ve \( 80 \mathrm{~cm} \) olan dikdörtgen şeklinde bir poster yaptırmak istemektedir. Aradığı baskı atölyesi, üretim makinelerinin Büşra'nın istediği boyutların eni ve boyunu aynı oranda küçülterek benzer şekilde bir poster…
Quesnon 2 oblainat. \begin{tabular}{c|c} \hline HIDM & U/s \\ \hline 1.00 & 0 \\ 0.90 & 100 \\ 0.81 & 200 \\ 0.74 & 300 \\ 0.68 & 400 \\ \hline \end{tabular} 1. Determine graplically, the order of the reaction. 11. What is the rate constant, \( k \), for this reaction? III. Culculate the…
9:02 Thu, Apr 1' \( 65 \% \) Question 6 of 15 Submit The most common sources of phosphate pollution that has led to eutrophication, the process in which a water body becomes overly enriched with nutrients, has resulted from the use of A) Dishwashing detergents B) Gasoline additives C)…
Express the concentration of cotinine in this study in ppm, ppb, and molarity. Assume the density of the wastewater is \( 1.0 \mathrm{~g} / \mathrm{mL} \). \( (1000 \mathrm{~g} / \mathrm{L}) \). concentration: \( 1.43 \times 10^{-3} \) ppm concentration: 1.43 ppb concentration: \( \square…
AN AQUEOUS SOLUTION OF ACOTC ACID IS FOUND INITIALC \( 1.65 \times 10^{-2} \mathrm{M} \). AT EQUIÜBRIIM THE CONCOMTIATION OE ACESTC ACID IS \( 4.75 \times 10^{-5} \mathrm{M} \) CALCULATE THTE CONCOYTRATWN OF \( \mathrm{H}_{3} \mathrm{O}_{(9 q)}^{+} \mathrm{CH}_{3} \mathrm{COO}_{\text {(9q)…
temperature (k) c+273=k
Scientists can learn a great deal about a community's drug use (both legal and illegal) by analyzing the contaminants in wastewater. In a recent study in New York State, chemists measured the concentration of cotinine, a derivative of nicotine that is produced in the liver and excreted in the…
A chemist titrates 160.0 mL of a 0.3261 M sodium hydroxide (NaOH) solution with 0.3549 M HCl solution at 25 °C. Calculate the pH at equivalence. Round your answer to 2 decimal places. Note for advanced students: you may assume the total volume of the solution equals the initial volume plus…
An analytical chemist is titrating 81.1 mL of a 0.8900M solution of butanoic acid (HC3H7CO2) with a 0.4600M solution of NaOH. The pKa of butanoic acid is 4.82 Calculate the pH of the acid solution after the chemist has added 86.4 mL of the NaOH solution to it. Note for advanced students: you…
Calculate the solubility at 25 °C of PbCrO? in pure water and in a 0.0040 M Na?CrO? solution. You'll find K?? data in the ALEKS Data tab. Round both of your answers to 2 significant digits. solubility in pure water: ? g/L solubility in 0.0040 M Na?CrO? solution: ? g/L
The solubility of AgBrO3 in water at 25 °C is measured to be 1.7 g/L. Use this information to calculate Ksp for AgBrO3. Round your answer to 2 significant digits.
44 . How many of the following will raise the \( \mathrm{pH} \) of a weak acid \( \mathrm{HA} \) in aqueous solution? I. addition of water II. making a buffered solution by adding \( \mathrm{NaA}(s) \) III. addition of \( \mathrm{NaCl}(s) \) IV. addition of \( \mathrm{HNO}_{3} \) V. titrating…
Question 1 (2 points) Suppose a student prepares several different mixtures of solutions of the hypothetical ions \( \mathrm{M}^{\mathrm{n+}} \) and \( \mathrm{XO}_{4}{ }^{\mathrm{y}} \), systematically varying the \( \mathrm{M}^{\mathrm{n+}} \) to \( \mathrm{XO}_{4}{ }^{\mathrm{y}-} \) mole…
GLOBE 10:01 Name: \( \qquad \) Rating: \( \qquad \) Course, Year, Section, and Group: \( \qquad \) Date: \( \qquad \) Exercise 1 NORMALITY Instructions: Solve the following problems. Show your solutions. 1. If \( 49 \mathrm{~g} \) of \( \mathrm{H}_{2} \mathrm{SO}_{4} \) is dissolved in water…
Consider the following reaction . MgCl 2 (aq)+2 NaOH(aq) longrightarrow Mg(OH) 2 (s)+2 NaCl(aq) A 167.0 mL solution of 0.296 M MgCl 2 reacts with a 39.66 mL solution of 0.587 M NaOH to produce Mg(OH) 2 and NaCl.
When the reaction \[ \mathrm{I}^{-}(a q)+\mathrm{OCl}^{-}(a q) \rightarrow \mathrm{IO}^{-}(a q)+\mathrm{Cl}^{-}(a q) \] was studied, the following data were obtained: \begin{tabular}{|c|c|c|} \hline\( \left[\mathrm{I}^{-}\right](\mathrm{mol} / \mathrm{L}) \) & {\(…
The general form of the rate law for this reaction is \[ \text { Rate }=k[\mathrm{NO}]^{x}\left[\mathrm{Cl}_{2}\right]^{y} \] We can determine the values of \( x \) and \( y \) by comparing the rates from the various experiments. To determine the value of \( y \), we use the results from…
The standard free-energy change in the reaction of water with ethyl acetate \( \left(\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{C}_{2} \mathrm{H}_{5}\right) \) to give ethanol \( \left(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\right) \) and acetic acid \( \left(\mathrm{CH}_{3} \mathrm{COOH}\right)…
pH of a 2.234 x 10^-6 M NH3
pH of a 1.38 x 10^-4 M lemon juice
pH of a 0.0099 M solution of HBr
pH of a 0.010 M solution of LiOH
pH of a 0.10 M solution of NaOH
a 0.10 M solution of NaOH
This question has multiple parts. Work all the parts to get the most points. The reaction \[ 2 \mathrm{NO}(g)+\mathrm{Cl}_{2}(g) \rightarrow 2 \mathrm{NOCl}(g) \] was studied at \( -10^{\circ} \mathrm{C} \). The following results were obtained where \[ \text { Rate…
Hypothesis You are required to prove/disprove the hypothesis that: the use of titration can allow you to determine with high accuracy the number of cocalate ligands present in the iron coxnlate complex synthesised in part A of experiment 1. Introduction Marry metal ions, excopt Group 1A, the…
For a hydrogen atom with an electron excited into a 5d orbital, a transition into the ionized statea) will emit a photon because the final orbital is lower in energy than the initial orbital.b) will not emit a photon because the final orbital is higher in energy than the initial orbital.c) will…
Ml * %/100=amount in grams 750 ml of 7.5% BSA
Ml * %/100=amount in grams Please make 666 microliters of 5% K3PO4
Calculate the solubility at 25 °C of AgCl in pure water and in a 0.0180M AgNO3 solution. You'll find Ksp data in the ALEKS Data tab. Round both of your answers to 2 significant digits. solubility in pure water: g/L solubility in 0.0180 M AgNO3 solution: g/L
Chapter 9 - Acids, Bases, and Salts 1. Acids in Water 2. Bases in Water 3. Write Conjugate Formulas 4. Brønsted Acids and Bases 5. Identify Conjugate Pairs in React... 6. Acid Nomenclature: Binary 7. Acid Nomenclature: Polyatomic 8. Monoprotic and Polyprotic Acids 9. pH and Acidity 10.…
The balanced equation for a given reaction is ( 4 X+3 Y ightarrow P ). The following data regarding initial reaction rates were collected in the lab. What is the rate law for the reaction? egin{tabular}{|l|l|l|l|} hline Trial & ( [X](M) ) & ( [Y](M) ) & Rate ( (M / s) ) \ hline 1 & 0.020 &…
A chemist titrates 170.0 mL of a 0.7322 M pyridine (C5H5N) solution with 0.2393 M HCl solution at 25 °C. Calculate the pH at equivalence. The pKb of pyridine is 8.77. Round your answer to 2 decimal places. Note for advanced students: you may assume the total volume of the solution equals the…
An analytical chemist is titrating 114.0 mL of a 0.5300M solution of benzoic acid (HC6H5CO2) with a 0.5600M solution of NaOH. The pKa of benzoic acid is 4.20 Calculate the pH of the acid solution after the chemist has added 117.7 mL of the NaOH solution to it. Note for advanced students: you…
Calculate the solubility at 25 °C of CuBr in pure water and in a 0.0030 M CoBr2 solution. You'll find Ksp data in the ALEKS Data tab. Round both of your answers to 2 significant digits. solubility in pure water: ? g/L solubility in 0.0030 M CoBr2 solution: ? g/L
e) If 10.0 mL 0.0510 M KMnO4 is required to titrate a 0.254 g impure sample of Na2C204, what is the percent C204* in this sample? t) What is the percent purity of the complex in part e?
If 10.0 mL 0.0510 M KMnO4 is required to titrate a 0.254 g impure sample of Na2C204, what is the percent C204* in this sample?
Suppose that a weak acid has a Ka of 2.5 x 10^-5. Calculate and enter its pKa below. Note. A pKa for a weak acid in an aqueous solution should be in the range of 1 to 7.
The reaction that occurred when the antacid mixed with the HCl resulted in an additional product (besides a salt and water). What is the name of the additional compound formed? Oxygen Hydrogen Carbon monoxide Carbon dioxide
It is important to perform multiple trials to show that the experimental results are reproducible. True or false?
Consider Data Table A below and determine the moles of NaOH required to reach the stoichiometric point.
Consider Data Table A below and determine the mass, in grams, of HCl available for neutralization.
An acetic acid buffer solution is required to have a pH of 5.27. You have a solution that contains 0.01 mol of acetic acid. What is the molarity of sodium acetate will you need to add to the solution? The pKa of acetic acid is 4.74. Note: report answer in decimal form with correct sig figs and…
Determine the correct neutralization reaction that occurs when HCl and NaOH are added to the buffer system that you investigated. Question 5 options: a) CH3COO-(aq) + H3O+(aq)→CH3COOH(aq) + H2O(l) b) CH3COOH(aq) + OH-(aq)→CH3COO-(aq) + H2O(l) c) HCl(aq) + CH3COO-(aq) →…
Sketch the Lewis structure and name the molecular VSEPR shape for oxygen difluoride, F2O.
(iii) an adiabatic reversible expansion. Q3(b) [15 Marks] (i) Using the information given, calculate the standard enthalpy of the combustion of acetaldehyde using the enthalpy of formation method. | Formation reactions | ?Hf° (kJ mol?¹) | | :--- | :--- | | 2C(s) + 2H?(g) + ½O?(g) ? CH?CHO(l)…
True or false? Buffers act most effectively when [HA+] and [A-] are equal.
True or false? The concentration of a weak acid will be equal to the concentration of the hydronium ion, H3O+, at equilibrium.
True or false? The buffer capacity is the pH range where a buffer effectively neutralizes added acids and bases, while maintaining a relatively constant pH.
Which has the higher electronegativity, an atom with atomic number 13 or an atom with atomic number 27? Justify your answer (including if you can't tell which one is more electronegative).
Sugar Standard Curve II (Lab Session): Calculating %Sugar from Nutrition Facts Introduction Overview Finding the %sugar of Your Standards Calculating Standard Densities Finding the %Sugar of Your Beverage Using Excel to analyze experimental results Calculating %Sugar from Nutrition…
pls help
Calculate the pH of the solution formed when 10.0 mL of 0.200 M NaOH is added to 30.0 mL of 0.100 M of benzoic acid, C6H5COOH. 9.499 4.501 4.200 1.301 1.602
thoughtful mini- Good运用系统内置的清洗规则，此文本仅包含题目内容及选项，无任何冗余页面元素、OCR错误
20) Please fill in the blanks given below with appropriate words or phrases. (5P) a) A ________ is a polyatomic ion composed of a central metal ion bonded to two or more molecules or ions called ligands. b) Solutions that resist changes in pH upon the addition of small amounts of an acid or…
18) In the qualitative cation analysis procedure, Bi3+ is detected by the appearance of a white precipitate of bismuthyl hydroxide, BiOOH(s). Please calculate the pH of a saturated aqueous solution of BiOOH. (5P) BiOOH(s) ? BiO+(aq) + OH-(aq) Ksp = 4 × 10^-10
17) Which of the following solids is (are) more soluble in a basic solution than in pure water? (5P) a) BaSO4 b) H2C2O4 c) Fe(OH)3 d) NaNO3 e) MnS
15) The sketch on the far left represents the ( left[mathrm{H}_{3} mathrm{O}^{+} ight] ) present in an acetic acid solution of molarity M. If the molarity of the solution is doubled, which of the sketches below best represents the resulting solution? (5P)
What a net ionic equation that occurs in a Na2HPO4/NaH2PO4 buffer solution when a small amount of HCl is added HPO42- (aq) + H2O(l) H2PO4-(aq) + H3O+(aq) HPO42- (aq) + H2O(l) H2PO4-(aq) + OH-(aq) H2PO4-(aq) + OH-(aq) HPO42- (aq) + H2O(l) HPO42- (aq) + H3O+(aq) …
14) According to the Bronsted-Lowry theory, which one or ones of the following are acids. (5P) a) HNO2 b) OCl-1 c) NH2-1 d) NH4+ e) CH3NH3+
Using the decay reaction A ? B as an example, sketch how [A] would change with time during the reaction, if the decay process was (i) zero order, (ii) first order, (iii) second order. Explain the significance of the order of reaction and mechanism of reaction.
What is the effective pH range for a CH3COONa / CH3COOH buffer? Ka = 1.8 x 10-5 5.74 3.74 - 4.74 4.74 3.74 - 5.74 3.74
Over what range of pH is a HOCl - NaOCl buffer effective? Ka = 3.5 x 10-8 8.46 6.46 - 8.46 7.46 7.46 - 8.46 6.46 - 7.46
Which of the following mixtures is suitable for making a buffer solution with the optimum pH of 9.2-9.3? The Ka values are given. HCOOH / HCOO- - 1.8 x 10-4 C5H5N/ C5H5NH+ - 6.7 x 10-6 NO2- / HNO2 - 4.5 x 10-4 NH3 / NH4+ - 5.6x 10-10 HCN / CN- - 4.0 x 10-10
13) *A solution is prepared having these initial concentrations: ( left[mathrm{Fe}^{3+} ight]=left[mathrm{Hg}_{2}{ }^{2+} ight]=0.5000 ) ( mathrm{M} ;left[mathrm{Fe}^{2+} ight]=left[mathrm{Hg}^{2+} ight]=0.03000 mathrm{M} ). The following reaction occurs among the ions at 25 ( { }^{circ}…
11) For which of the following reaction or reactions would you expect the extent of the forward reaction to increase with increasing temperatures? (5P) (a) $PCl_5(g) ightleftharpoons PCl_3(g) + Cl_2(g)$ $Delta H^o = +92.5 ext{ kJ}$ (b) $SO_3(g) ightleftharpoons SO_2(g) + frac{1}{2}O_2(g)$…
10) Three different sets of data of [A] versus time given in the following table for the reaction A ? Products. Which of these sets of data corresponds to a second order reaction? (5P) a) I b) II c) III d) None | I | | II | | III | | | :--- | :--- | :--- | :--- | :--- | :--- | | Time, s |…
Q1(a) [10 Marks] The table below shows the data obtained from a kinetics experiment for the reaction 2NO (g) + Cl? (g) ? 2 NOCl (g) by determining the initial rate of loss of NO at different reactant concentrations at 25pC: Experiment | [NO] / M | [Cl?] / M | Rate of loss of NO / Ms?¹ 1 |…
Make 50 ml of 10x lbs. buffer. Sop to make 1 l NaCl 80 g
Predict the normal boiling point of hydrogen peroxide (H2O2) from the following data: | | ?H°f, kJ/mol | ?S°, J/(mol•K) | |---|---|---| | H2O2(l) | -187.8 | 110 | | H2O2(g) | -136.3 | 233 | Part 1 (1 point) Tb = [ ] °C
6) The solutions pictured below are separated by a semipermeable membrane that permits only the passage of water molecules. In what direction a net flow of water occurs, that is from a) left to right b) right to left? Glycerol is ( mathrm{HOCH}_{2} mathrm{CH}(mathrm{OH}) mathrm{CH}_{2}…
4) Which one of the following substances is most water soluble? (5P) a) C10H8(s) b) NH2OH(s) c) C6H6(l) d) CaCO3(s)
3) Please rank the following substances in order of increasing surface tension at room temperature. (5 P) a) CH3OH b) CCl4 c) CH3CH2OCH2CH3
1) Which one of the following substances has the highest boiling point? a) ( mathrm{C}_{6} mathrm{H}_{6} ) b) ( mathrm{C}_{6} mathrm{H}_{5} mathrm{Cl} ) c) ( mathrm{C}_{6} mathrm{H}_{5} mathrm{Br} ) d) ( mathrm{C}_{6} mathrm{H}_{5} mathrm{OH} )
18. A mixture of ( 1.00 mathrm{~g} mathrm{H}_{2} ) and ( 1.06 mathrm{~g} mathrm{H}_{2} mathrm{~S} ) in a ( 0.500 mathrm{~L} ) flask comes to equilibrium at ( 1670 mathrm{~K}: 2 mathrm{H}_{2}(mathrm{~g})+mathrm{S}_{2}(mathrm{~g}) ightleftharpoons ) ( 2 mathrm{H}_{2} mathrm{~S}(mathrm{~g}) ).…
A chemist titrates 160.0 mL of a 0.3261 M sodium hydroxide (NaOH) solution with 0.3549 M HCl solution at 25 °C. Calculate the pH at equivalence. Round your answer to 2 decimal places. Note for advanced students: you may assume the total volume of the solution equals the initial volume plus…
An analytical chemist is titrating 81.1 mL of a 0.8900M solution of butanoic acid (HC3H7CO2) with a 0.4600M solution of NaOH. The pKa of butanoic acid is 4.82 Calculate the pH of the acid solution after the chemist has added 86.4 mL of the NaOH solution to it. Note for advanced students: you…
Calculate the solubility at 25 °C of PbCrO? in pure water and in a 0.0040 M Na?CrO? solution. You'll find K?? data in the ALEKS Data tab. Round both of your answers to 2 significant digits. solubility in pure water: ? g/L solubility in 0.0040 M Na?CrO? solution: ? g/L
The solubility of AgBrO3 in water at 25 °C is measured to be 1.7 g/L. Use this information to calculate Ksp for AgBrO3. Round your answer to 2 significant digits.
Ml * %/100=amount in grams 750 ml of 7.5% BSA
Ml * %/100=amount in grams Please make 666 microliters of 5% K3PO4