115b08_Exam3_key

115b08_Exam3_key - Chem 115b Spring 2008 Exam 3 Professor...

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Chem 115b KEY Spring 2008 Print Name: Last First Exam 3 Last 3 digits of Student ID # March 13, 2008 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 24 2 11 3 20 4 15 5 15 6 15 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. (24 pts) (a) ( 3 pts) Circle the correct answer: The two salts AgX and AgY have very similar solubilities in water. It is known that the salt AgX is much more soluble in acid than is AgY. What can be said about the relative strengths of the acids HX and HY? A. Nothing. X B. HY is stronger than HX. C. HX is stronger than HY. D. The acids have equal strengths. E. Cannot be determined. (b) ( 4 pts) Circle: Which of these procedures would NOT make a pH = 3.75 buffer? A. Mix 50 mL of 0.20 M formic acid and 100 mL of 0.10 M sodium formate B. Mix 50 mL of 0.20 M formic acid and 50 mL of 0.10 M sodium hydroxide C. Titrate a solution of 50 mL of 0.20 M formic acid with a strong base until the pH is 3.75. X D. Titrate 50 mL of 0.20 M hydrobromic acid with a strong base until the pH is 3.75. E. Start with 200 mL of 0.10 M sodium formate and add 100 mL of 0.10 M HBr.
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This note was uploaded on 07/14/2008 for the course CHEM 115BL taught by Professor Qin,reisler during the Spring '08 term at USC.

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115b08_Exam3_key - Chem 115b Spring 2008 Exam 3 Professor...

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