Exam 2B, Spring 2005

1. Complete and balance the following reactions:

a. H₃PO₄(aq) + CsOH(aq)

b. C₆H₅NH₂(aq) + HBr(aq)

c. HClO(aq) + H₂O(l)

d. Ba(OH)₂(s) + HClO₄(aq)

2. Complete and balance the following reaction and identify the acid, the base, the conjugate acid, and the conjugate base:

bicarbonate ion + cyanide ion

3. Identify the Lewis acid and the Lewis base in the following reaction.

Cd²⁺(aq) + 4 NH₃(aq) → ← [Cd(NH₃)₄]²⁺(aq)

4. Identify the stronger acid in pair given below. Briefly (5 words or less) justify your reasoning.

a. H₂Se or H₂Te

b. H₂SO₃ or H₂SeO₃

5. Calculate the pH and pOH of the following solutions:

a. 2.0×10^–4 M hydrobromic acid.

b. 3.0×10^–4 M lithium hydroxide.

c. 4.0×10^–4 M calcium hydroxide.

6. Consider the reaction shown below, which has ΔH = 131 kJ/mol.

C(s) + H₂O(g) → ← CO(g) + H₂(g)

a. Which way will the reaction shift if graphite (solid carbon) is added to the reaction? Explain.

b. Which way will the reaction shift if the temperature is raised? Explain.

7. Estimate the pH of a 1.0×10^–2 M solution of phenol, C₆H₅OH. K_a = 1.0×10^–10

Answers