Quiz 4-solutions

# Quiz 4-solutions - Version 214 Quiz 4 laude(51635 This...

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Version 214 – 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 5.0points What is the concentration of SO 2 - 4 in 2.0 M H 2 SO 4 ? K a1 is strong and K a2 = 1 . 2 × 10 - 2 . 1. 4 . 0 × 10 - 1 M 2. 2 . 0 × 10 - 1 M 3. 4 . 0 × 10 - 2 M 4. 1 . 2 × 10 - 2 M correct 5. 1 . 0 × 10 - 7 M Explanation: 002 5.0points 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. 7.40 2. 4.67 correct 3. 9.95 4. 1.41 5. 3.95 Explanation: 003 5.0points What is the pH of a solution containing 10 - 9 M HClO 4 ? 1. 8.768 2. 9.000 3. 5.000 4. 6.996 correct 5. 5.232 Explanation: 004 5.0points Consider the following K sp values for metal carbonates: CdCO 3 = 2 . 5 × 10 - 14 CoCO 3 = 8 . 0 × 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. Cd 2+ and Pb 2+ 4. Co 2+ and Cu 2+ 5. Cd 2+ and Co 2+ 6. Cu 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

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