Exam 2A, Spring 2002

1. Complete and balance the following acid/base reactions. Label the acid, base, conjugate acid, and conjugate base for each reaction.

a. aqueous nitric acid plus solid calcium hydroxide

b. aqueous perchloric acid plus water

c. HCl(aq) + CN^–(aq)

d. HNO₂(aq) + H₂O(l)

2. Write the chemical reaction needed to determine the pH and give the pH for the following solutions.

a. 0.0010 M hydroiodic acid.

b. 0.0010 M strontium hydroxide

3. Indicate the stronger acid in each pair. Explain your reasoning in 5 words or less. For the stronger acid, write out the balanced reaction of the acid with water.

a. CF₃COOH vs. CH₃COOH

b. H₄SiO₄ vs. H₃PO₄

c. HCrO₄^– vs. HMnO₄

4. Complete the following reactions and indicate which direction equilibrium will favor:

a. HClO₂(aq) + BrO₂^–(aq)

b. NH₃(aq) + HF(aq)

5. A 0.0010 M solution of hypoiodous acid (HIO, K_a = 2.3×10^–11) was prepared. Find the pH.

Answers