Quiz 2-solutions

# Quiz 2-solutions - Version 189 Quiz 2 Laude(52390 This...

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Version 189 – Quiz 2 – Laude – (52390) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 5.0 points Using the law oF mass action, write the equilibrium expression For the Following reac- tion: 2 Cu 2+ (aq) + 4 I - (aq) ←→ 2 CuI(s) + I 2 (aq) 1. K = [I 2 ][CuI] 2 [Cu 2+ ] 2 [I - ] 4 2. K = [Cu 2+ ] 2 [I - ] 4 [I 2 ][CuI] 2 3. K = [Cu 2+ ] 2 [I - ] 4 [I 2 ] 4. K = [I 2 ] [Cu 2+ ] 2 [I - ] 4 correct Explanation: The equilibrium expression, K , is the ratio oF products to reactants raised to their respec- tive stoichiometric coe±cients. Solid species are not included in the expression. 002 5.0 points The reaction Ag + ( aq ) + Cl - ( aq ) AgCl(s) has an equilibrium oF 10 20 (K eq = 10 20 ). IF you have a beaker containing 1 liter oF wa- ter with 0.1 mol oF AgCl(s) in it along with 10 - 6 M Ag + ( aq ) and 10 - 15 M Cl - ( aq ), how does the reaction shiFt? 1. not at all 2. leFt correct 3. right 4. not enough inFormation Explanation: Q = 1 [Ag + ] · [Cl - ] = 1 10 - 6 · 10 - 15 = 10 21 Because Q is greater than K, the reaction will shiFt to the leFt.

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Quiz 2-solutions - Version 189 Quiz 2 Laude(52390 This...

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