Quiz 4, Spring 2011 - Version 284 Quiz 4 laude (51635) 1...

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Unformatted text preview: Version 284 Quiz 4 laude (51635) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 5.0 points What is the pH of a solution containing 0.2 M RbH 2 PO 4 ? The pK a1 is 2.12, the pK a2 is 7.21, and the pK a3 is 12.68. 1. 1.41 2. 7.40 3. 4.67 correct 4. 9.95 5. 3.95 Explanation: 002 5.0 points Consider the following K sp values for metal carbonates: CdCO 3 = 2 . 5 10- 14 CoCO 3 = 8 . 10- 13 CuCO 3 = 2 . 5 10- 10 PbCO 3 = 1 . 5 10- 13 Which pair would best be separated by frac- tional precipitation? 1. Cd 2+ and Cu 2+ correct 2. Co 2+ and Pb 2+ 3. Cu 2+ and Pb 2+ 4. Co 2+ and Cu 2+ 5. Cd 2+ and Co 2+ 6. Cd 2+ and Pb 2+ Explanation: All the salts are 1:1 ratios so the K sp s can be directly compared for solubility. The pair that will be the easiest to separate will be the pair that have their K sp values the farthest apart (Cd and Cu)....
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Quiz 4, Spring 2011 - Version 284 Quiz 4 laude (51635) 1...

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