solution8_pdf - spano velasco (ds28282) hw08 Fakhreddine...

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Unformatted text preview: spano velasco (ds28282) hw08 Fakhreddine (52395) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 1.0 points Assume the molar solubility of silver chromate (Ag 2 CrO 4 ) is represented as x . Which of the following expressions correctly expresses the relationship between the molar solubility of silver chromate and the solubility product constant ( K sp ) for this compound? 1. K sp = 4 x 3 correct 2. K sp = 2 x 3 3. K sp = x 2 4. K sp = 2 x 2 5. K sp = 4 x 2 Explanation: The equation for the dissociation of Ag 2 CrO 4 is written as Ag 2 CrO 4 2 Ag + + CrO- 4 . The expression for K sp = bracketleftbig Ag + bracketrightbig 2 bracketleftbig CrO- 4 bracketrightbig . Since the molar solubility is x , K sp can be rewritten (in terms of x ) as K sp = [2 x ] 2 [ x ] = 4 x 3 . bracketleftbig Ag + bracketrightbig = 2 x because for every salt molecule that dissociates, 2 Ag + ions are produced. 002 1.0 points The compound M 2 X 3 has a molar solubility of 0.0500 M. What is the value of K sp for M 2 X 3 ? 1. . 000169 2. . 00075 3. 3 . 13 10- 7 4. 1 . 13 10- 5 5. 3 . 38 10- 5 correct Explanation: 003 1.0 points A solution in equilibrium with solid barium phospate is found to have a barium ion con- centration of 5 10- 4 mol/L and a K sp of 5 10- 23 . Calculate the concentration of phosphate ion. 1. 6 . 32 10- 7 mol/L correct 2. 3 . 16 10- 10 mol/L 3. 5 . 77 10- 11 mol/L 4. 4 . 64 10- 7 mol/L 5. 2 . 50 10- 64 mol/L Explanation: 004 1.0 points Which of the following compounds has the LOWEST molar solubility in water?...
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This note was uploaded on 04/23/2009 for the course CH 52395 taught by Professor Fakhreddine during the Spring '09 term at University of Texas at Austin.

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solution8_pdf - spano velasco (ds28282) hw08 Fakhreddine...

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