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Unformatted text preview: Exam #4 Sample Questions Chapter 16 (some 15) Multiple Choice ____ 1. To make a buffer using acetic acid one would add A. carbonic acid. C. sodium chloride. E. ammonium phosphate. B. sodium acetate. D. ammonium chloride. ____ 2. Consider a buffer solution made up of H 2 PO and HPO . H 2 PO 4- (aq) + H 2 0 = HPO (aq) + H 3 + (aq) For H 2 PO 4- , K a = 6.2 x 10-8 . What mole ratio of HPO to H 2 PO will give a pH of 7.35? A. 0.14 to 1 B. 0.72 to 1 C. 1 to 1 D. 1.4 to 1 ____ 3. A buffer solution is 0.500 M in ascorbic acid and 0.500 M in sodium ascorbate. Its pH is 4.10. After adding NaOH until 1 liter of the buffer is also 0.01M in NaOH which of the following correctly estimates the new pH after the buffer does its work on the added NaOH ? A. 4.08. B. 4.10. C. 4.12. D. 3.95. E. 10.15. ____ 4. A buffer solution is 0.500 M in acetic acid and 0.500 M in sodium acetate. Its pH is 4.74. What is its pH after dilution by a factor of 2 that is making the solution 0.250 M in acetic acid and 0.250 M in sodium acetate?dilution by a factor of 2 that is making the solution 0....
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This note was uploaded on 04/10/2008 for the course CHEM 1451 taught by Professor Krause during the Spring '08 term at University of Central Arkansas.
- Spring '08