115b07_Exam3

115b07_Exam3 - Chem 115b Spring 2007 Exam 3 March 8, 2007...

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Chem 115b Spring 2007 Print Name: Last First Exam 3 Last 3 digits of Student ID # March 8, 2007 TA's Name P r o f e s s o r R e i s l e r M a j o r Questions Points Score Grader 1 16 2 22 3 14 4 14 5 18 6 16 Total 100 INSTRUCTIONS 1. YOU MUST SHOW YOUR WORK TO RECEIVE CREDIT. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. YOU MUST USE BLACK INK TO BE ABLE TO REQUEST A REGRADE 4. Please read each question carefully before you write your answer. 5. There are 6 questions on 6 pages. ± Please Sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature:
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1 1. (16 pts) (A) (4 pts) Which of the following solutions will be the best buffer at a pH of 9.26? ( K a for HC 2 H 3 O 2 is 1.8 x 10 -5 , K b for NH 3 is 1.8 x 10 -5 ). a) 0.10 M HC 2 H 3 O 2 and 0.10 M Na C 2 H 3 O 2 b) 5.0 M HC 2 H 3 O 2 and 5.0 M Na C 2 H 3 O 2 c) 0.10 M NH 3 and 0.10 M NH 4 Cl d) 5.0 M NH 3 and 5.0 M NH 4 Cl e) 5.0 M HC 2 H 3 O 2 and 5.0 M NH 3 Answer: ______________ (B) (3 pts) The K sp of silver acetate (Ag C 2 H 3 O 2 ) is 1.9 x 10 -3 . You have a saturated solution in equilibrium with the solid salt.
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115b07_Exam3 - Chem 115b Spring 2007 Exam 3 March 8, 2007...

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