Exam 2A, Spring 1999

1. Identify the acid, base,conjugate acid, and conjugate base in the following reaction:

HCl(aq) + (CH₃)NH₂(aq) → (CH₃)NH₃⁺(aq) + Cl^–(aq)

2. Identify the Lewis acid and Lewis base in the following reaction:

Fe²⁺(aq) + 6 H₂O(l) → ← Fe(H₂O)₆²⁺(aq)

3. Complete and balance the following reactions:

a. HI(aq) + H₂O(l)

b. H₂O₂(aq) + H₂O(l)

c. NH₄⁺(aq) + H₂PO₄^–(aq)

d. CN^–(aq) + H₂CO₃(aq)

4. Find the pH of the following solutions at 25 °C:

a. 0.0056 M nitric acid

b. 1.00 g of hydrogen chloride dissolved in 1.00 L of water

c. 6.2×10^–5 M solution of calcium hydroxide.

5. Find the hydronium ion and hydroxide ion concentrations for the following solutions at 25 °C:

a. a perchloric acid solution with pH = 2.35

b. a solution prepared by dissolving 1.00 g of lithium hydroxide in 1.00 L of water

c. a 3.6×10^–4 M solution of magnesium hydroxide

d. a sodium hydroxide solution with pOH = 4.1

6. For each of the following, indicate the stronger acid.

a. H₂S, H₂Te

b. HClO₃, HClO₂

c. NH₃, NH₂^–

7. A 0.0045 M solution of an acid was found to be 0.033% ionized at 25 °C. Find the pK_a of the acid.

8. Find the pH of a 0.037 M solution of cyanic acid, HOCN, at 25 °C.

Answers