Sample Questions - Chapter 18

CHAPTER 18
Examples of
Multiple Choice Questions

These questions have been taken from exams given in previous years. They roughly cover the material in the order presented in the textbook.
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1.: Which one of the following is a weak acid?; (a) HNO₃; (b) HI; (c) HBr; (d) HF; (e) HClO₃
2.: Which salt is not derived from a strong acid and a strong soluble base?; (a) MgCl₂; (b) Ba(NO₃)₂; (c) LiClO₄; (d) CsBr; (e) NaI
3.: Which one of the following is a strong electrolyte?; (a) H₂O; (b) KF; (c) HF; (d) HNO₂; (e) (CH₃)₃N
4.: In a sample of pure water, only one of the following statements is always true at all conditions of temperature and pressure. Which one is always true?; (a) [H₃O⁺] = 1.0 x 10^-7 M; (b) [OH^-] = 1.0 x 10^-7 M; (c) pH = 7.0; (d) pOH = 7.0; (e) [H₃O⁺] = [OH^-]
5.: If K_w is 2.9 x 10^-15 at 10^oC, what is the pH of pure water at 10^oC?; (a) 6.72; (b) 7.00; (c) 7.27; (d) 7.53; (e) none of these
6.: The pOH of a solution of NaOH is 11.30. What is the [H⁺] for this solution?; (a) 2.0 x 10^-3; (b) 2.5 x 10^-3; (c) 5.0 x 10^-12; (d) 4.0 x 10^-12; (e) 6.2 x 10^-8
7.: The [H₃O⁺] in a 0.050 M solution of Ba(OH)₂ is:; (a) 1.0 x 10^-5 M; (b) 5.0 x 10^-2 M; (c) 1.0 x 10^-13 M; (d) 5.0 x 10^-10 M; (e) 2.0 x 10^-5 M
8.: What is the approximate pH of a solution labeled 6 x 10^-5 M HBr?; (a) 4.2; (b) 4.5; (c) 5.8; (d) 9.8; (e) 8.2
9.: What is the pH of 500 mL of solution containing 0.0124 grams of Ca(OH)₂?; (a) 11.04; (b) 9.68; (c) 2.96; (d) 3.17; (e) 10.83
10.: The pH of a solution is 4.80. What is the concentration of hydroxide ions in this solution?; (a) 4.2 x 10^-9 M; (b) 1.6 x 10^-5 M; (c) 3.6 x 10^-12 M; (d) 6.3 x 10^-10 M; (e) 2.0 x 10^-8 M
11.: A solution in which [H⁺] = 10^-8 M has a pH of ___ and is ___.; (a) 8, acidic; (b) 6, basic; (c) -6, basic; (d) -8, neutral; (e) 8, basic
12.: The pH of a 0.02 M solution of an unknown weak acid is 3.7. what is the pK_a of this acid?; (a) 5.7; (b) 4.9; (c) 3.2; (d) 2.8; (e) 3.7
13.: What is the approximate pH of a solution labeled 0.050 M HClO?; (a) 5.1; (b) 3.9; (c) 4.4; (d) 2.1; (e) 7.6
14.: What is the pH of a solution labeled 0.30 M (CH₃)₃N?; (a) 9.5; (b) 10.8; (c) 9.2; (d) 11.7; (e) 12.2
15.: Which of the following solutions has the lowest pH at 25^oC? (No calculations required.); (a) 0.2 M sodium hydroxide; (b) 0.2 M hypochlorous acid; (c) 0.2 M ammonia; (d) 0.2 M benzoic acid; (e) pure water
16.: A 0.10 M solution of a weak acid, HX, is 0.059% ionized. Evaluate K_a for the acid.; (a) 3.8 x 10^-9; (b) 6.5 x 10^-7; (c) 7.0 x 10^-6; (d) 4.2 x 10^-6; (e) 3.5 x 10^-8
17.: What is the percent ionization of an 1.2 M HF solution?; (a) 2.4 %; (b) 4.2 %; (c) 0.84 %; (d) 0.082 %; (e) 0.22 %
18.: Which of the following weak acids ionizes to give the strongest conjugate base?; (a) HClO; (b) CH₃COOH; (c) HF; (d) HNO₂; (e) HCN
19.: Which of the following is true about a 0.10 M solution of a weak acid, HX?; (a) [X^-] = 0.10 M; (b) pH = 1; (c) [HX] > [H⁺]; (d) [H⁺] = 0.10 M; (e) both b and d
20.: Calculate the hydrolysis constant for the cyanide ion, CN^-.; (a) 2.5 x 10^-5; (b) 1.0 x 10^-7; (c) 4.0 x 10^-10; (d) 5.6 x 10^-10; (e) none of these
21.: Calculate the pH of a 0.50 M solution of NaNO₂.; (a) 12.18; (b) 5.48; (c) 1.82; (d) 8.52; (e) 7.00
22.: What is the concentration of a sodium acetate solution if the pH of the solution is 9.19?; (a) 0.30 M; (b) 0.43 M; (c) 2.1 M; (d) 0.068 M; (e) 0.59 M
23.: What is the pH of 0.060 M NH₄Cl?; (a) 5.06; (b) 5.12; (c) 5.18; (d) 5.24; (e) 5.35
24.: What is the concentration of ammonium chloride in a solution if its pH is 4.80?; (a) 0.25 M; (b) 0.30 M; (c) 0.45 M; (d) 0.60 M; (e) 0.15 M
25.: The pH of 0.15 M trimethylammonium chloride, (CH₃)₃NHCl, a salt, is 5.34. What is the percent hydrolysis?; (a) 0.0031 %; (b) 0.0068 %; (c) 0.0094 %; (d) 0.011 %; (e) 0.022 %

Answers to Chapter 18

1. (d) 2. (a) 3. (b) 4. (e) 5. (c) 6. (a) 7. (c) 8. (a) 9. (e) 10. (d) 11. (e) 12. (a) 13. (c) 14. (d) 15. (d) 16. (e) 17. (a) 18. (e) 19. (c) 20. (a) 21. (d) 22. (b) 23. (d) 24. (c) 25. (a)

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