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Unformatted text preview: lawrence (cdl678) Homework #10 Holcombe (52460) 1 This printout should have 14 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points Determine the molar solubility of calcium chloride (CaCl 2 ) if K sp = 2 . 5 10 2 . 1. 0.1 M 2. 4 M correct 3. 1 M 4. 0.005 M 5. 10 M Explanation: The equation for K sp = x (2 x ) 2 = 4 x 3 x = parenleftbigg 1 4 K sp parenrightbigg 1 / 3 . Plugging in numbers gives you 3.97 M, or about 4 M. 002 10.0 points A saturated solution of MgF 2 (s) is found to have a Mg 2+ concentration of 2 . 10 3 M. What is the value of K sp for MgF 2 ? 1. 8 . 10 9 2. 3 . 2 10 8 correct 3. 1 . 10 9 4. 4 . 10 9 5. 4 . 10 12 Explanation: [Mg 2+ ] = 2.0 10 3 M MgF 2 Mg 2+ + 2 F K sp = [Mg 2+ ] [F ] 2 = ( x ) (2 x ) 2 = 4 x 3 = 4 ( 2 10 3 ) 3 = 3 . 2 10 8 003 10.0 points The molar solubility of PbSO 4 is 1 . 34 10 4 mol / L . What is the value for the K sp for PbSO 4 ? 1. 8 . 8 10 11 2. 3 . 45 10 7 3. 1 . 16 10 4 4. 3 . 10 99 5. 1 . 8 10 8 correct Explanation: PbSO 4 Pb 2+ + SO 2 4 K sp = x 2 = (1 . 34 10 4 ) 2 = 1 . 8 10 8 . 004 10.0 points Arrange the compounds I) CuS K sp = 1 . 3 10 36 II) PbCl 2 K sp = 1 . 6 10 5 III) FeS K sp = 6 . 3 10 18 IV) Hg 2 Cl 2 K sp = 2 .....
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This note was uploaded on 04/09/2010 for the course CH 52460 taught by Professor Holcombe during the Spring '10 term at University of Texas at Austin.
 Spring '10
 Holcombe

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