ch 302 hw 7 solution

# ch 302 hw 7 solution - reyes(mr29667 H07 Solubility...

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reyes (mr29667) – H07: Solubility – Mccord – (90540) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points The compound M 2 X 3 has a molar solubility oF 0.0140 M. What is the value oF K sp For M 2 X 3 ? 1. 1 . 94 × 10 - 8 2. 1 . 04 × 10 - 6 3. 5 . 38 × 10 - 10 4. 5 . 81 × 10 - 8 correct 5. 1 . 65 × 10 - 5 Explanation: 002 10.0 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. 3 . 16 × 10 - 10 mol/L 2. 6 . 32 × 10 - 7 mol/L correct 3. 4 . 64 × 10 - 7 mol/L 4. 5 . 77 × 10 - 11 mol/L 5. 2 . 50 × 10 - 64 mol/L Explanation: 003 10.0 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 = x 2 2. K sp = 2 x 3 3. K sp = 4 x 2 4. K sp = 2 x 2 5. K sp = 4 x 3 correct 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 = b Ag + B 2 b CrO - 4 B . 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 . b Ag + B = 2 x because For every salt molecule that dissociates, 2 Ag + ions are produced. 004 10.0 points Which oF the Following compounds has the LOWEST molar solubility in water? 1.

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## This note was uploaded on 08/07/2010 for the course CH 90540 taught by Professor Mccord during the Summer '10 term at University of Texas.

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ch 302 hw 7 solution - reyes(mr29667 H07 Solubility...

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