CHM 2046C Module 11
Kotz’s 5^th Edition Chapter 17
Sample Multiple Choice #2

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1. A strong acid and weak acid respectively are

a.	HF and HCl.
b.	H2SO4 and H2SO3.
c.	H3PO3 and H3PO4.
d.	HCl and HBr.
e.	CH3COOH and CH3CH2COOH.

2. All of the following are strong acids EXCEPT

a.	HNO3.
b.	HClO2.
c.	HCl.
d.	HBr.
e.	H2SO4.

3. Which of the following is a strong electrolyte in aqueous solution?

a.	NH3
b.	CH3COOH
c.	CO2
d.	HNO2
e.	NH3 + CH3COOH

4. All of the following salts can be derived by the reaction of a weak acid with a strong base EXCEPT

a.	NaNO2.
b.	KCN.
c.	Ca(OCl)2.
d.	Li2CO3.
e.	CsI.

5. Which one of the following salts is not derived from a strong acid and a strong base/

a.	BaCl2
b.	KCl
c.	NaNO3
d.	Na2SO3
e.	LiBr

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6. All of the following statements are characteristics of acids EXCEPT

a.	proton donors.
b.	neutralize bases.
c.	react with nonmetals to give a salt and oxygen.
d.	react with bases to give a salt and water.
e.	taste sour.

7. Which of the following would not be expected to function as a Brønsted base?

a.	N2H4
b.	N2H5^+
c.	N^3-
d.	N3^-
e.	N2H6^2+

8. In the reversible reaction, HCO₃^-(aq) + OH^-(aq) <--> CO₃^2-(aq) + H₂O, the Brønsted acids are

a.	HCO3^- and CO3^2-.
b.	HCO3^- and H2O.
c.	OH^- and H2O.
d.	OH^- and CO3^2-.
e.	HCO3^-, H2O, and OH^-.

9. All of the following are acid-base conjugate pairs EXCEPT

a.	H3O^+, OH^-
b.	H2O, OH^-
c.	NH4^+, NH3
d.	CH3COOH, CH3COO^-
e.	HPO4^2-, PO4^3-

10. The conjugate base of HNO₂ is

a.	HNO2.
b.	H3O^+.
c.	H^+.
d.	NO2^-.
e.	H2O.

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11. A solution has a pH value of 10.82. The OH^- concentration for this solution is

a.	1.5 x 10^-11.
b.	1.5 x 10^-10.
c.	6.6 x 10^-10.
d.	1.5 x 10^-5.
e.	6.6 x 10^-4.

12. A solution which has a pH of 8.7 would be described as

a.	very acidic.
b.	slightly acidic.
c.	neutral.
d.	very basic.
e.	slightly basic.

13. The pH of a 0.01 M phosphoric acid solution is approximately

a.	1.
b.	3.
c.	7.
d.	11.
e.	13.

14. In a sample of pure water, which of the following statements is always true?

a.	[H3O^+] = 1.0 x 10^-7
b.	[OH^-] = 1.0 x 10^-7
c.	pH = 7.0
d.	[H3O^+] = [OH^-]
e.	Kw = 1.0 x 10^-14

15. The K_a (HS^-) is the equilibrium constant for the reaction

a.	H2S(aq) + H2O <--> H3O^+(aq) + HS^-(aq).
b.	HS^-(aq) + H2O <--> H2S(aq) + OH^-(aq).
c.	HS^-(aq) + H3O^+ <--> H2S(aq) + H2O.
d.	HS^-(aq) + OH^-(aq) <--> S^2-(aq) + H2O.
e.	HS^-(aq) + H2O <--> H3O^+(aq) + S^2-(aq).

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16. A 0.10 M solution of weak monoprotic acid has a hydronium ion concentration of 5.0 x 10^-4 M. The equilibrium constant, K_a, for this acid is

a.	5.0 x 10^-2.
b.	5.0 x 10^-3.
c.	5.0 x 10^-4.
d.	2.5 x 10^-5.
e.	2.5 x 10^-6.

17. For a given weak acid, HA, the value of K_a

a.	will change with the pH.
b.	will change with the pOH.
c.	will change with temperature.
d.	cannot be less than 10^-7.
e.	cannot be greater than 10^-7.

18. The K_b (HCO₃^-) is the equilibrium constant for the reaction

a.	CO3^2- + H2O <--> HCO3^- + OH^-.
b.	HCO3^- + H2O <--> H3O^+ + CO3^2-.
c.	HCO3^- + H2O <--> H2CO3 + OH^-.
d.	HCO3^- + H3O^+ <--> H2CO3 + H2O.
e.	HCO3^- + OH^- <--> CO3^2- + H2O.

19. What is [H₃O⁺] for a 0.010 M HOBr solution? (K_a(HOBr) = 2.5 x 10^-9)

a.	2.5 x 10^-11 M
b.	2.5 x 10^-7 M
c.	5.0 x 10^-7 M
d.	5.0 x 10^-6 M
e.	5.0 x 10^-5 M

20. A 0.0100 M acid is 4.0 x 10¹% dissociated. The equilibrium constant, K_a, for this acid is

a.	1.6 x 10^-4.
b.	1.6 x 10^-3.
c.	2.7 x 10^-3.
d.	3.6 x 10^-3.
e.	1.6 x 10^-2.

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21. K_b for hydrazine, N₂H₄, is 8.5 x 10^-7. K_a for the hydrazinium ion is
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a.	1.2 x 10^6.
b.	8.5 x 10^-21.
c.	2.8 x 10^-5.
d.	8.5 x 10^-5.
e.	1.2 x 10^-8.

22. Which of the following acids has the strongest conjugate base?

a.	ascorbic acid, Ka = 8.0 x 10^-5
b.	benzoic acid, Ka = 6.5 x 10^-5
c.	3-chlorobenzoic acid, Ka = 1.5 x 10^-4
d.	2-hydroxybenzoic acid, Ka = 1.1 x 10^-3
e.	chloroacetic acid, Ka = 1.4 x 10^-3

23. H₃PO₄ is a _______ acid, and H₃PO₄ is a _______ acid than H₂PO₄^-, and H₂PO₄^- is a _______ acid than HPO₄^2-.

a.	stronger, stronger, stronger
b.	weak, weaker, weaker
c.	weak, stronger, stronger
d.	strong, weaker, weaker
e.	strong, weaker, stronger

24. One molar solutions of the salts Na₃PO₄, Al(NO₃)₃, and NH₄Cl will result in solutions which are respectively

a.	basic, neutral, acidic.
b.	acidic, basic, neutral.
c.	basic, acidic, acidic.
d.	acidic, basic, neutral.
e.	acidic, acidic, neutral.

25. All of the following would be expected to serve as a Lewis acid EXCEPT

a.	AlCl3.
b.	NO^+.
c.	Fe^3+.
d.	SbF5.
e.	NH3.

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