CRS Questions Follow:

1. CRS Questions Follow:

2. The acid dissociation constant for hexanoic acid is 1.41x10-5. A buffer solution is prepared by mixing hexanoic acid and sodium hexanoate and is found to have a pH of 4.9. What is the ratio of the salt to acid concentration in this buffer solution? 1. 0 2. 0.5 3. 0.8 4. 1.0 5. 2.5

3. The acid dissociation constant for hexanoic acid is 1.41x10-5. A buffer solution is prepared by mixing hexanoic acid and sodium hexanoate and is found to have a pH of 4.9. What is the ratio of the salt to acid concentration in this buffer solution? 1. 0 2. 0.5 3. 0.8 4. 1.0 5. 2.5

4. What is the pH of a buffer solution composed of equimolar amounts of dimethylamine and dimethylammonium chloride? 1. 3.27 4. 10.73 2. 4.73 dimethylamine, Kb = 5.4x10-4 5. 14.00 3. 7.00

5. What is the pH of a buffer solution composed of equimolar amounts of dimethylamine and dimethylammonium chloride? 1. 3.27 4. 10.73 2. 4.73 dimethylamine, Kb = 5.4x10-4 5. 14.00 3. 7.00

6. A buffer solution containing equimolar amounts of the base, aniline, and the salt of its conjugate acid, aniline hydrochloride, will result in an acidic buffer solution. 1. True 2. False aniline Kb = 4.3x10-10

7. A buffer solution containing equimolar amounts of the base, aniline, and the salt of its conjugate acid, aniline hydrochloride, will result in an acidic buffer solution. 1. True 2. False aniline Kb = 4.3x10-10

8. Which of the following statements is incorrect? • A buffer solution contains a weak acid or base and the salt of its conjugate base or acid, respectfully. alt of its conjugate 2. A buffer solution resists changes in pH upon addition of small amounts of acid or base. small amounts of 3. The more concentrated the buffer solution is, the better its buffer capacity. 4. Water is a buffer solution with a pH of 7. 5. A buffer solution containing 0.10 M acid and conjugate base has the same pH as a solution containing 1.0 M of the same acid and conjugate base.

9. Which of the following statements is incorrect? • A buffer solution contains a weak acid or base and the salt of its conjugate base or acid, respectfully. alt of its conjugate 2. A buffer solution resists changes in pH upon addition of small amounts of acid or base. small amounts of 3. The more concentrated the buffer solution is, the better its buffer capacity. 4. Water is a buffer solution with a pH of 7. 5. A buffer solution containing 0.10 M acid and conjugate base has the same pH as a solution containing 1.0 M of the same acid and conjugate base.