Rev Prob. Exam 3 09-106 S 11

Rev Prob. Exam 3 09-106 S 11 - Review Problems for Exam...

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Review Problems for Exam 3 (with selected answers) 09-106 Spring 2011 I. For the following statements, circle T if the statement is TRUE and F if it is FALSE. T F 1. The strongest base that can exist in liquid H 2 O is OH - . T F 2. CH 3 NH 2 is a weak base and a poor conductor of electricity when dissolved in water. T F 3. In the reaction CO 2 (g) + OH - (aq) b HCO 3 - (aq), CO 2 is a Lewis acid. T F 4. When a weak base is titrated with a strong acid, the pH at the equivalence point is always < 7. T F 5. For a buffer containing a weak base B and its conjugate B-H + , if [B] > [B-H + ] the buffer is more resistant to pH changes upon the addition of OH - than upon the addition of H + . T F 6. An H 2 SO 3 / KHSO 3 buffer can be made by adding a strong base to a solution of H 2 SO 3 T F 7. For a buffer with a fixed ratio of [HA] to [A - ], doubling the concentrations of both HA and A - will increase the buffer capacity. T F 8. The end point in a titration estimates the equivalence point upon observation of a change in indicator color. T F 9. The weaker a base is, the stronger its conjugate acid is. T F 10. If a strong base is diluted sufficiently with pure water, the pH will be lower than 7. II. Circle the letter of the best answer for the following multiple choice questions. 1.

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Rev Prob. Exam 3 09-106 S 11 - Review Problems for Exam...

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