Quiz 4-solutions-3 - Version 144 Quiz 4 laude (51635) 1...

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Unformatted text preview: Version 144 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. 4.67 correct 2. 3.95 3. 7.40 4. 1.41 5. 9.95 Explanation: 002 5.0 points 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. 1 . 10- 7 M 2. 1 . 2 10- 2 M correct 3. 4 . 10- 2 M 4. 4 . 10- 1 M 5. 2 . 10- 1 M Explanation: 003 5.0 points Hint: The common ion for this problem is hydroxide. What is the molar solubility of Zn(OH) 2 in a solution buffered at pH of 8.0? (Zn(OH) 2 , K sp = 3 . 10- 17 ) 1. 5 . 10- 6 2. 8 . 10- 4 3. 2 . 10- 6 4. 3 . 10- 5 correct 5. 4 . 10- 9 Explanation: pH=8 means that pOH=6 and [OH- ]=10- 6 K sp = [Zn 2+ ][OH- ] 2 (solve for Zn 2+ ) [Zn 2+ ] = 3 . 10...
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Quiz 4-solutions-3 - Version 144 Quiz 4 laude (51635) 1...

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