Acids Quiz #3 Leveling effect, Anhydrides, Hydrolysis, Relationships

1. Which of the following oxides will form the most acidic solution?

A. SO₂

B. MgO

C. Na₂O

D. Al₂O₃

2. Which one of the following salts will produce an acidic solution?

A. KBr

B. LiCN

C. NH₄Cl

D. NaCH₃COO

3. The balanced equation for the reaction between sodium oxide and water is

A. Na₂O + H₂O → 2NaOH

B. Na₂O + H₂O → 2NaH + O₂

C. Na₂O + H₂O → 2Na + H₂O₂

D. Na₂O + H₂O → 2Na + H₂ ⁺O₂

4. Normal rainwater is slightly acidic due to the presence of dissolved

A. methane

B. carbon dioxide

C. sulphur dioxide

D. nitrogen dioxide

5. Which of the following oxides would hydrolyze to produce hydroxide ions?

A. NO

B. SO₂

C. Cl₂O

D. Na₂O

6. The approximate pH of “normal” rainwater is

A. 0

B. 6

C. 7

D. 8

7. Which of the following oxides would hydrolyze to produce hydronium ions?

A. CaO

B. SO₂

C. MgO

D. Na₂O

8. Which of the following gasses results in the formation of acid rain?

A. H₂

B. O₃

C. SO₂

D. NH₃

9. Consider the following acid base solution

HSO₃^- + HF ⇄ H₂SO₃ + F^-

The order of Bronsted-Lowry acids and bases in this equation is

A. acid + base ⇄ acid + base

B. acid + base ⇄ base + acid

C. base + acid ⇄ base + acid

D. base + acid ⇄ acid + base

10. The conjugate acid of OH^- is

A. H⁺

B. O^2-

C. H₂O

D. H₃O⁺

11. Which of the following 0.10 M solutions will have the greatest electrical

conductivity?

A. HF

B. NH₃

C. NaOH

D. C₆H₅COOH

12. The amphiprotic ion HSeO^3- can undergo hydrolysis according to the following equations

HSeO3^- + H2O ⇄ H2SeO3 + OH^-	Kb
HSeO3^- + H2O ⇄ SeO3^2-+ H3O^+	Ka

An aqueous solution of HSeO₃^- is found to be acidic. This observation indicates that when it is added to water, HSeO₃^- behaves mainly as a

A. proton donor, and K_b is less than K_a

B. proton donor, and K_b is greater than K_a

C. proton acceptor, and K_b is less than K_a

D. proton acceptor, and K_b is greater than K_a

13. The K_b expression for HPO₄^2- is

A. [PO₄^3-][H₃O⁺] B. [HPO₄^2-][ OH ^- ]

[HPO₄^2-] [H₂PO₄^-]

C. [H₂PO₄^-][ OH ^- ]                  D. [HPO₄^2-][ H₃O⁺]

        [HPO₄^2-]    [PO₄^3-]

14. Given the equilibrium: H₂BO₃^- + H₂PO₄^- ⇌ H₃BO₃ + HPO₄^2-

Which is the strongest acid?

A. HPO₄^2-

B. H₃BO₃

C. H₂PO₄^-

D. H₂BO₃^-

15. Which species is not amphiprotic?

A. H₂O

B. H₃BO₃

C. H₂PO₄^-

D. H₂C₆H₅O₇^-

16. What is produced when CH₃NH₂ acts as a base in water?

A. CH₃NH^-

B. CH₃NH₃⁺

C. CH₃NH₂⁺

D. CH₂NH₂^-

17. What species will form when H⁺ ions are in the presence of H₂O molecules?

A. HO⁺

B. H₂O⁺

C. H₃O⁺

D. H₂O₂⁺

18. What is the conjugate acid of the base HAsO₄^2-?

A. AsO₄^3-

B. H₂AsO₄^-

C. H₄AsO₄⁺

D. H₃AsO₄

19. Which solution will have the greatest electrical conductivity?

A. 0.50 M HCl

B. 0.10 M RbOH

C. 0.50 M K₃PO₄

D. 2.0 M C₆H₁₂O₆

20. The following equilibrium favours the formation of products:

NH₂OH + CH₃NH₂ ⇌ CH₃NH^- + NH₃OH⁺

Which species is the strongest acid?

A. NH₃OH⁺

B. NH₂OH

C. CH₃NH₂

D. CH₃NH^-

21. Which of the following solutions would have the greatest [OH^-]?

A. 0.1 M HCO₃^-

B. 0.1 M HPO₄^2-

C. 0.1 M H₂PO₄^-

D. 0.1 M CO₃^2-

22. Which of the following amphiprotic ions will act predominantly as a base in

solution?

A. HSO₃^-

B. HSO₄^-

C. H₂PO₄^-

D. HPO₄^2-

23. Which is the strongest base?

A. Cl^-

B. NO₂^-

C. HPO₄^2-

D. CH₃COO^-

24. Water has the greatest tendency to act as an acid with which of the following?

A. Cl^-

B. NO₂^-

C. HPO₄^2-

D. CH₃COO^-

25. Water has the greatest tendency to act as a base with which of the following?

A. HF

B. H₂CO₃

C. H₃PO₄

D. CH₃COOH

26. Which of the following will have the smallest Ka value?

A. HF

B. H₂CO₃

C. H₃PO₄

D. CH₃COOH

27. Which of the following will have the smallest Kb value?

A. IO₃^-

B. NH₃

C. CN^-

D. HPO₄^2-

28. What volume of 0.500 M NaOH is required to neutralize 25.0 mL 0.250 M HBr ?

A. 5.00 mL

B. 12.5 mL

C. 20.0 mL

D. 25.0 mL

29. Which of the following Ka values represents the acid that is strongest?

A. Ka = 2.8 x 10^-18

B. Ka = 8.2 x 10^-18

C. Ka = 4.4 x 10^-22

D. Ka = 6.4 x 10^-22

30. Which of the following Ka values represents the acid with the strongest conjugate

base?

A. Ka = 2.8 x 10^-18

B. Ka = 8.2 x 10^-18

C. Ka = 4.4 x 10^-22

D. Ka = 6.4 x 10^-22