1. HSO₄^? is the conjugate _____of H₂SO₄ and the conjugate _____of SO₄^2?

acid / acid

acid / base

base / acid

base / base

2. If [H₃O⁺] in an aqueous solution is 7.6× 10^-9 M, what is the concentration of[OH^-]? Hint: [H₃O⁺][OH^-] = 1 x 10^-14

7.6 × 10^-23 M.

6.4 × 10^-5 M.

1.3 × 10⁺⁸ M.

7.6 × 10^-9 M.

1.3 × 10^-6 M.

3. Which of the following solutions is a buffer? Hint:a buffer must contain a conjugate acid/base pair.

a solution of hydrochloric acid and sodium acetate

a solution of acetic acid and sodium acetate

a solution of acetic acid and sodium sulfate

a solution of hydrochloric acid and sodium sulfate

a solution of sulfuric acid and sodium sulfate

4. Calculate the molarity of anHCl solution if 50.0 mL of a 0.150 M NaOHsolution is required to titrate 10.0 mL of the HClsolution? Hint: M₁V₁ =M₂V₂

0.750 M

0.600 M

0.0300 M

0.150 M

7.50 M