Ch 6_Part 4_111311 - Le Chtelier's Principle"If a change in conditions(a"stress is imposed on a system at equilibrium the equilibrium position will

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1 11/13/2011 Le Châtelier’s Principle “If a change in conditions (a “stress”) is imposed on a system at equilibrium, the equilibrium position will shift in a direction that tends to reduce that change in conditions. A + B C + D + Energy For example: In the reaction above, if more A or B is added you will force the reaction to produce more product ; if either is removed , the reaction will shift to form more reactants . If C or D is added you will force the reaction to form more reactants , if either is removed , the reaction will shift to form more products . If it is heated you will get more reactants, and if cooled , more products . Factors that control the position of chemical equilibria are: Concentration Pressure Temperature NOTE: catalysts influence rate, not position of equilibrium Equilibrium Position
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2 11/13/2011 The Effect of a Change in Concentration–I Given an equilibrium equation such as : CH 4 (g) + NH 3 (g) HCN (g) + 3 H 2 (g) CH 4 (g) + NH 3 (g) HCN (g) + 3 H 2 (g) CH 4 (g) + NH 3 (g) HCN (g) + 3 H 2 (g) Add NH 3 Forces equilibrium to produce more product. Forces the reaction equilibrium to go back to the left and produce more of the reactants. Remove NH 3 The Effect of a Change in Concentration–II CH 4 (g) + NH 3 (g) HCN (g) + 3 H 2 (g) CH 4 (g) + NH 3 (g) HCN (g) + 3 H 2 (g) Add H 2 Forces equilibrium to go toward the reactants. Remove HCN Forces equilibrium to make more product and replace the lost HCN.
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3 11/13/2011 Consider the following reaction: CoCl 4 2- (aq) + 6 H 2 O( l ) Co(H 2 O) 6 2+ (aq) + 4 Cl - (aq) HCl (aq) is added to the system at equilibrium. This increases the [Cl
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This note was uploaded on 01/18/2012 for the course CHEM 142B taught by Professor John during the Fall '11 term at University of Washington.

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Ch 6_Part 4_111311 - Le Chtelier's Principle"If a change in conditions(a"stress is imposed on a system at equilibrium the equilibrium position will

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