Arsenic acid, H3AsO4, is used industrially to manufacture insecticides. Arsenic acid is a polyprotic acid with K1 = 2.5 × 10-4, K2 = 5.6 × 10-8, and K3 = 3 × 10-13. What is the concentration of the HAsO42- in a solution whose initial arsenic acid concentration was 0.35 M?

A) 9.4 × 10-3 M B) 2.5 × 10-4 M C) 8.8 × 10-5 M D) 5.6 × 10-8 M E) None of these choices are correct. A) 9.4 × 10-3 M B) 2.5 × 10-4 M C) 8.8 × 10-5 M D) 5.6 × 10-8 M E) None of these choices are correct.

What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2) = 1.5 × 10-10

A) 0.38 B) 5.91 C) 8.09 D) 9.82 E) 13.62 A) 0.38 B) 5.91 C) 8.09 D) 9.82 E) 13.62

What is the pH of a 0.050 M triethylamine, (C2H5)3N, solution? Kb for triethylamine is 5.3 × 10-4.

A) 11.69 B) 8.68 C) 5.32 D) 2.31 E) < 2.0 A) 11.69 B) 8.68 C) 5.32 D) 2.31 E) < 2.0

What is the [OH-] for a solution at 25°C that has [H3O+] = 8.23 × 10-2 M?

A) > 10-5 M B) 1.22 × 10-6 M C) 8.23 × 10-12 M D) 1.22 × 10-13 M E) 8.23 × 10-16 M A) > 10-5 M B) 1.22 × 10-6 M C) 8.23 × 10-12 M D) 1.22 × 10-13 M E) 8.23 × 10-16 M

Formic acid, which is a component of insect venom, has a Ka = 1.8 × 10-4. What is the [H3O+] in a solution that is initially 0.10 M formic acid, HCOOH?

A) 4.2 × 10-3 M B) 8.4 × 10-3 M C) 1.8 × 10-4 M D) 1.8 × 10-5 M E) 1.8 × 10-6 M A) 4.2 × 10-3 M B) 8.4 × 10-3 M C) 1.8 × 10-4 M D) 1.8 × 10-5 M E) 1.8 × 10-6 M

The substance Ca(OH)2 is considered

A) a weak Arrhenius acid. B) a weak Arrhenius base. C) a strong Arrhenius acid. D) a strong Arrhenius base. E) a neutral compound. A) a weak Arrhenius acid. B) a weak Arrhenius base. C) a strong Arrhenius acid. D) a strong Arrhenius base. E) a neutral compound.

A solution is prepared by adding 0.10 mol of potassium acetate, KCH3COO, to 1.00 L of water. Which statement about the solution is correct?

A) The solution is basic. B) The solution is neutral. C) The solution is acidic. D) The concentrations of potassium ions and acetate ions will be identical. E) The concentration of acetate ions will be greater than the concentration of potassium ions. A) The solution is basic. B) The solution is neutral. C) The solution is acidic. D) The concentrations of potassium ions and acetate ions will be identical. E) The concentration of acetate ions will be greater than the concentration of potassium ions.

The substance (CH3CH2)2NH is considered

A) a weak acid. B) a weak base. C) a strong acid. D) a strong base. E) a neutral compound. A) a weak acid. B) a weak base. C) a strong acid. D) a strong base. E) a neutral compound.

The substance NH3 is considered

A) a weak acid. B) a weak base. C) a strong acid. D) a strong base. E) a neutral compound. A) a weak acid. B) a weak base. C) a strong acid. D) a strong base. E) a neutral compound.