13 - Different Reaction, Different K Lecture 13 HOW PUSHY:...

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Lecture 13 HOW PUSHY: Le Chatelier’s Principle Key Idea: The dynamic competition between reactants and products is sensitive to external perturbations. Different Reaction, Different K K = [AB] [A][B] = 5 (1)(1) = 5 + Reaction 1 starting reactants A + B ! AB equilibrium mixture K = [CD] [C][D] = 1 8 + Reaction 2 starting reactants Same Reaction, Same K K = [CD] [C][D] = 2 (4)(4) = 1 8 + Reaction 2A starting reactants equilibrium mixture C + D ! CD K = [CD] [C][D] = 1 8 Reaction 2B + starting reactants 50 mL 0.10 M Co 2+ + 50 mL 12.0 M Cl - Co 2+ (aq) + 4 Cl (aq) ! CoCl 4 2– (aq) pink blue Reaction of Cl ! with Co 2+ K = [CoCl 4 2 ! ] [Co 2+ ][Cl - ] 4 = 2.5 x 10 -4 [Cl ! ] CoCl 4 2 ! 6.00 Co 2+ 0.050 Concentration (M) 5.9522 M 0.0381 M 0.0119 M Equilibrium Calculations K = 0.00025 = x (0.050 - x)(6.0 ! 4x) 4 Assume that x is small ~ x (0.050 - x)(6.0) 4 Solve for x x ~ 0.0119 Adding More Cl ! to Co 2+ Co 2+ (aq) + 4 Cl (aq) ! CoCl 4 2– (aq) pink blue 50 mL 0.10 M Co 2+ + 50 mL 12.0 M Cl - 50 mL 0.10 M Co 2+ + 100 mL 12.0 M Cl - 50 mL 0.10 M Co 2+ + 150 mL 12.0 M Cl -

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Ratio of Equilibrium Concentrations Equilibrium Calculations K = 0.0119 (0.0381)(5.952) 4 = 0.00025 K = 0.0164 (0.0166)(7.934) 4 = 0.00025
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This note was uploaded on 09/30/2008 for the course CHEM 11006 taught by Professor Majda during the Fall '08 term at Berkeley.

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13 - Different Reaction, Different K Lecture 13 HOW PUSHY:...

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