Numerade

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Prashant Bana

Numerade educator

Which of the following weak acids has the strongest conjugate base? A) nitrous acid, Ka = 4.5 × 10^-4 B) benzoic acid, Ka = 6.3 × 10^-5 C) dihydrogen phosphate ion, Ka = 6.2 × 10^-8 D) acetic acid, Ka = 1.8 × 10^-5 E) hydrocyanic acid, Ka = 4.0 × 10^-10

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Christopher Dzorkpata

Numerade educator

41) Calculate the pH of a solution formed by mixing 250.0 mL of 0.900 M NH4Cl with 250.0 mL of 1.60 M NH3. The Kb for NH3 is 1.8 × 10-5. A) 9.50 B) 10.12 C) 9.18 D) 10.83 E) 8.25

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Christopher Dzorkpata

Numerade educator

A solution contains 3.8 × 10-2 M in Al3+ and 0.29 M in NaF. If the Kf for AlF6 3- is 7 × 1019, how much aluminum ion remains at equilibrium? A) 9.1 × 10-19 M B) 1.1 × 10-19 M C) 4.4 × 10-20 M D) 3.1 × 10-22 M E) 1.9 × 10-21 M

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Christopher Dzorkpata

Numerade educator

) Calculate the cell potential for the following reaction that takes place in an electrochemical cell at 25°C. Mn(s) ? Mn2+(aq, 1.28 M) II Ag+(aq, 0.000837 M) ? Ag(s) A) 0.00 V B) -1.28 V C) -0.84 V D) 1.79 V E) 1.98 V

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Kartik Indoliya

Numerade educator

Given the following equation, N2O(g) + NO2(g) ? 3 NO(g) ?G°rxn = -23.0 kJ Calculate ?G°rxn for the following reaction. 3 NO(g) ? N2O(g) + NO2(g) A) 69.0 kJ B) -69.0 kJ C) 23.0 kJ D) -7.67 kJ E) -23.0 kJ

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Kartik Indoliya

Numerade educator

Calculate the cell potential for the following reaction that takes place in an electrochemical cell at 25°C. Mn(s) | Mn2+(aq, 1.28 M) || Ag+(aq, 0.000837 M) | Ag(s) A) 0.00 V B) -1.28 V C) -0.84 V D) 1.79 V E) 1.98 V

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Kartik Indoliya

Numerade educator

A container of orange juice at 25°C has a hydronium concentration of 1.78 × 10-3M. What is the pH of the juice? A) 3.31 B) 7.00 C) 2.75 D) 11.25 E) 1.84

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Alkendra Singh

Numerade educator

Using the Lewis concept of acids and bases, identify the Lewis acid and base in each of the following reactions: Co(NO3)3(s) + 6H2O(l) ? Co(H2O)63+(aq) + 3NO3-(aq) (CH3)2NH(g) + HF(g) ? (CH3)2NH2F(s)

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Alkendra Singh

Numerade educator

Using the Brønsted-Lowry concept of acids and bases, identify the Brønsted-Lowry acid and base in each of the following reactions: HS?(aq) + H?O(l)?H?S(aq) + OH?(aq) CH?NH?(g) + BBr?(g)?CH?NH?BBr?(s)

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Alkendra Singh

Numerade educator

Using the Arrhenius concept of acids and bases, identify the Arrhenius acid and base in each of the following reactions: 2KOH(aq) + H2SO4(aq) ? K2SO4(aq) + 2H2O(l) (CH3)3N(g) + HI(g) ? (CH3)3NHI(s)

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taylor h.