Quiz 4-solutions-2 - Version 445 Quiz 4 laude (51635) 1...

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Version 445 – Quiz 4 – laude – (51635) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 5.0 points 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. Co 2+ and Pb 2+ 2. Cd 2+ and Cu 2+ correct 3. Co 2+ and Cu 2+ 4. Cd 2+ and Co 2+ 5. Cd 2+ and Pb 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 that will be the easiest to separate will be the pair that have their K sp values the Farthest apart (Cd and Cu). 002 5.0 points Hint: The common ion For this problem is hydroxide. What is the molar solubility oF Zn(OH) 2 in a solution bu±ered at pH oF 8.0? (Zn(OH)
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Quiz 4-solutions-2 - Version 445 Quiz 4 laude (51635) 1...

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