Exam3 - pokharel(yp624 – hw08 – Fakhreddine –(52395...

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pokharel (yp624) – hw08 – Fakhreddine – (52395) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – fnd all choices be±ore answering. 001 1.0 points Assume the molar solubility o± silver chromate (Ag 2 CrO 4 ) is represented as x . Which o± the ±ollowing expressions correctly expresses the relationship between the molar solubility o± silver chromate and the solubility product constant ( K sp ) ±or this compound? 1. K sp = x 2 2. K sp = 2 x 2 3. K sp = 4 x 2 4. K sp = 4 x 3 correct 5. K sp = 2 x 3 Explanation: The equation ±or the dissociation o± Ag 2 CrO 4 is written as Ag 2 CrO 4 2 Ag + + CrO - 4 . The expression ±or K sp = b Ag + B 2 b CrO - 4 B . Since the molar solubility is x , K sp can be rewritten (in terms o± x ) as K sp = [2 x ] 2 [ x ] = 4 x 3 . b Ag + B = 2 x because ±or every salt molecule that dissociates, 2 Ag + ions are produced. 002 1.0 points The compound M 2 X 3 has a molar solubility o± 0.0260 M. What is the value o± K sp ±or M 2 X 3 ? 1. 1 . 28 × 10 - 6 correct 2. 1 . 19 × 10 - 8 3. 1 . 23 × 10 - 5 4. 0 . 000105 5. 4 . 28 × 10 - 7 Explanation: 003 1.0 points A solution in equilibrium with solid barium phospate is ±ound to have a barium ion con- centration o± 5 × 10 - 4 mol/L and a K sp 5 × 10 - 23 . Calculate the concentration o± phosphate ion. 1. 4 . 64 × 10 - 7 mol/L 2. 2 . 50 × 10 - 64 mol/L 3. 6 . 32 × 10 - 7 mol/L correct 4. 5 . 77 × 10 - 11 mol/L 5. 3 . 16 × 10 - 10 mol/L Explanation: 004 1.0 points Which o± the ±ollowing compounds has the LOWEST molar solubility in water? 1.
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This note was uploaded on 05/17/2009 for the course CH 52395 taught by Professor Fakhreddine during the Spring '09 term at University of Texas.

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Exam3 - pokharel(yp624 – hw08 – Fakhreddine –(52395...

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