2007 Exam03 - Exam3_Sp2007 Multiple Choice Identify the...

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Exam3_Sp2007 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. What is the pH of solution formed by combining 700 mL of 0.2M HCl with 300 mL of 0.5 M NaOH ? a. 1.7 b. 2.0 c. 4.0 d. 10.0 e. 12.0 ____ 2. What is the pH of a 0.50 M NO 2 - solution. The K a of HNO 2 is 4.5 x 10 -4 a. 7.76 b. 7.54 c. 8.04 d. 8.52 e. 9.00 ____ 3. Consider the following: 1) HCl and NaOH 2) CH 3 COOH and CH 3 COONa 3) NH 3 and NH 4 Cl Of these three pairs of compounds, which could be combined to make a buffer? a. all of them b. 1 and 2 c. 2 and 3 d. only 3 e. 1 and 3 ____ 4. Which of the following solutions could accomodate the largest amount of added acid or base (without a large change in pH)? a. 0.1 M NH 3 and 0.1M NH 4 + b. 0.5 M NH 3 and 0.5M NH 4 + c. 0.1 M NH 3 and 0.1 M NaOH d. 0.5 M NH 3 and 0.5M HCl e. 0.5 M NH 3 and 0.2M NH 4 + ____ 5. A buffer of pH 4.6 is prepared from a weak acid HA and its conjugate base A - . To increase the pH of this buffer a. increase the ratio of HA to A - b. decrease the ratio of HA to A - c. add HNO 3
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d. add HCOOH e. the pH can not be increased ____ 6. A buffer solution is 0.500 M in ascorbic acid and 0.500 M in sodium ascorbate. Its pH is 4.10. After addition of 10 mL of 1 M NaOH to 1.00 L of this buffer, the most likely value of the pH is a. 4.08. b. 4.10. c. 4.12. d. 5.95.
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This note was uploaded on 04/23/2010 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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2007 Exam03 - Exam3_Sp2007 Multiple Choice Identify the...

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