Exam 3A, Spring 2000

1. Complete and balance the following reactions:

a. C₆H₅NH₂(aq) + H₂O(l)

b. C₂H₅NH₂(aq) + HOCl(aq)

c. Co²⁺(aq) + H₂O(l)

d. Cr(NO₃)₂(aq) + K₂CO₃(aq)

e. Ba(C₂H₃O₂)₂(aq) + H₂SO₄(aq)

f Cu(NO₃)₂(aq) + NH₃(aq)

2. Consider a 0.15 M solution of triethylamine, (C₂H₅)₃N, at 25 °C.

a. Find the pH of the solution.

b. Enough triethylammonium chloride, (C₂H₅)₃NHCl, is added to the solution to make the concentration of the triethylammonium ion 0.20 M. Find the pH of this buffer.

c. 5.0 g of perchloric acid is added to 1.0 L of the buffer prepared in part b. What is the new pH?

3. Consider silver iodide at 25 °C.

a. What is the molar solubility of silver iodide in pure water?

b. What is the molar solubility of silver iodide in 0.035 M sodium iodide solution?

c. What is the molar solubility of silver iodide in 1.0 M ammonia solution?

4. Indicate whether the following salts are acidic, basic, or neutral.

a. NaClO₄

b. NaC₂H₃O₂

c. Mn(HSO₄)₂

d. Mn(OH)₂

e. NH₄NO₃

Answers