Worksheet 10 - 1. CH 302 Spring 2007 Practice Exam 2 Which...

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CH 302 Spring 2007 Practice Exam 2 1. Which of the following is not a strong acid? a. HCl b. H 2 SO 4 c. HClO 4 d. H 2 CO 3 e. HClO 3 2. What is the pH of a buffer made up of 0.5 M pyridine (C 5 H 5 N) and 0.75 M C 5 H 5 NH + ? The pK b of pyridine is 8.70. a. 8.9 b. 6.4 c. 5.1 d. 7.6 3. Which of the following systems produces a buffer? I. 0.5 M CH 3 COOH and 0.5 M NaCH 3 COO II. 0.5 M CH 3 COOH, 1.0 M NaCH 3 COO, and 0.25 M Ba(OH) 2 III. 0.75 M CH 3 COOH and 0.5 M NaOH IV. 1.0 M Na + and 1.0 M NaOH V. 0.5 M CH 3 COOH, 1.0 M NaCH 3 COO, and 0.5 M HCl a. I, II, III, IV, and IV b. None of them c. II, III, and V only d. I only e. I, II, and IV only f. I and II only 4. Rank the following compounds in terms of increasing basicity. Compound pK b C 6 H 5 NH 2 9.38 NH 3 4.74 HONH 2 8.18 (CH 3 )N 4.13 CH 3 NH 2 3.30 a. C 6 H 5 NH 2 < HONH 2 < NH 3 < (CH 3 )N < CH 3 NH 2 b. CH 3 NH 2 < (CH 3 )N < NH 3 < HONH 2 < C 6 H 5 NH 2 c. C 6 H 5 NH 2 < HONH 2 < (CH 3 )N < NH 3 < CH 3 NH 2 d. CH 3 NH 2 < NH 3 < (CH 3 )N < HONH 2 < C 6 H 5 NH 2 5. What is the buffer capacity of a buffer made up of 1.2 M CH 3 NH 2 and 1.4 M CH 3 NH 3 + ? For CH 3 NH 2 , pK b = 3.3. a. 1.4 M for H + , 1.2 M for OH - b. 1.2 M for H + , 1.4 M for OH - c. 0.2 M for H + , 0.2 M for OH - d. 2.6 M for H + , 2.6 M for OH - 6. 100 mL of 1.5 M HCN (pK a = 9.40) and 75 mL of 2.5 M CN - are mixed together, and 2 g of NaOH are added. What is the final pH? a. 4.60 b. 9.13 c. 9.40 d. 9.77 e. 13.25
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7. Identify the equivalence points on this titration curve. a.
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This note was uploaded on 05/02/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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Worksheet 10 - 1. CH 302 Spring 2007 Practice Exam 2 Which...

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