Ace - AI Tutor
Ask Our Educators
Textbooks
My Library
Flashcards
Scribe - AI Notes
Notes & Exams
Download App
Claire Michael

Claire M.

Divider

Questions asked

ANSWERED

Manisha Sarker verified

Numerade educator

A 20.00 mL portion of HCI solution was titrated with 0.2417 M NaOH in order to determine the molarity of the acid solution. If 18.62 mL of NaOH were required to reach the equivalence point (pH=7), what was the concentration of the HCI?

View Answer
 divider
ANSWERED

David Collins verified

Numerade educator

What must be the molarity of NH4Cl in a . 10M solution of NH3 to form a buffer with a pH of 9.00? Assume that the addition of NH4Cl does not change the volume of the solution. The Ko for NH3 is 1.8 × 10^-5

View Answer
 divider
ANSWERED

Sima Sarker verified

Numerade educator

Soft drink companies have been under fire recently for the use of benzoic acid (HCHsOz) and sodium benzoate (NaCHsOz) in their beverages, for the potential carcinogenic properties of these chemicals. What concentration of sodium benzoate is necessary to produce a pH of 4.00 in a .200 M solution of benzoic acid? The Ka for benzoic acid is 6.40 x 10^-5 •

View Answer
 divider
ANSWERED

Sima Sarker verified

Numerade educator

What is the pH of a solution made by adding 0.300 mol of ascorbic acid (vitamin C), and .0300 mol of sodium ascorbate, to enough water to make 1.00 L of solution? The Ka for ascorbic acid (HC6H706) is 7.9 x 10^-5.

View Answer
 divider
ANSWERED

David Collins verified

Numerade educator

Propionic acid (HCHsO2) is used as a preservative in baked goods. Often, potassium propionate is used in conjunction to buffer the acid and its effect. What is the pH of a 0850M solution of propionic acid, in 0600M potassium propionate (KCH,02)? The Ka for propionic acid is 1.34 x 10-S

View Answer
 divider
ANSWERED

David Collins verified

Numerade educator

Ephedrine (CloHisON), a central nervous system stimulant, is used in nasal sprays as a decongestant. It acts as a weak base in the body. What are the equilibrium concentrations of CloHIsON, CIoHIsONH*, and OH, in a .0350M solution that has a pH of 11.33? What is the Ko for ephedrine?

View Answer
 divider
ANSWERED

Lijeesh Krishnan verified

Numerade educator

Ethylamine (CzHsNH2) is an important base used in the production of many organic compounds. What is the molar concentration of hydroxide ions in a 0750M solution of ethylamine? What is the pH of the solution? The Ko for ethylamine is 4.00 x 10-6. Ethylamine reacts with water to form C2HsNH*' and OH"'

View Answer
 divider
ANSWERED

David Collins verified

Numerade educator

Up to 200 pounds of ammonia can be applied to each acre of agricultural crop a year in this country to provide plants with nitrogen, an essential element. What is the concentration of hydroxide ion in a 150M solution of ammonia? The Kb for ammonia is 1.80 x 10⁻⁵. NH3 reacts with water to form NH4⁺ and OH⁻.

View Answer
 divider
ANSWERED

David Collins verified

Numerade educator

What is the pH of a 0.0370M solution of H3PO4, commonly used to make soda? It has a Ka of 7.10 × 10-3. H3PO4 dissociates primarily into H+ and H2PO4-

View Answer
 divider
ANSWERED

Sima Sarker verified

Numerade educator

Formic acid, or HCO2H, It is an important intermediate in chemical synthesis and occurs naturally, most famously in the venom of bee and ant stings. A 0.100M sample was analyzed by a student, and found to have a pH of 2.38 at 25°C. Calculate the Ka for formic acid, and calculate its percent ionization at this temperature.

View Answer
 divider