Lec-12-Chap14-4-b

Lec-12-Chap14-4-b - Lec-12-Chap14-4-b 9/29/2009 Lec-12:...

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Lec-12-Chap14-4-b 9/29/2009 Chemical Equilibrium. Round-up 1 Lec-12: Chemical Equilibrium Chapter 14 1 Shift of a Chemical Equilibrium Le Chatelier’s Principle Consider the reaction       3 22 1 SO g O g 2 SO g      1/2 3 SO S O O c K At equilibrium the concentrations satisfy How does the reaction system, originally at equilibrium, respond if we disturb it? 2
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Lec-12-Chap14-4-b 9/29/2009 Chemical Equilibrium. Round-up 2 Shift of a Chemical Equilibrium Le Chatelier’s Principle a) We disturb it by adding more of a reactant, say O 2 (g)           1/2 1/2 2 2 2 2 0 33 SO S SO O O SO O cc K Q K Q         3 22 1 SO g O g 2 SO g Adding O 2 increases the concentration [O 2 ], so the denominator becomes too large. The reaction system is out of equilibrium, and will respond by decreasing the concentrations in the denominator. The reaction is displaced to the “right”. By displacing the equilibrium to the right the system counters to some extent the addition of O 2 (g). 3 Shift of a Chemical Equilibrium Le Chatelier’s Principle b) We disturb it by adding more of the product SO 3 (g)           1/2 1/2 2 2 2 3 3 0 2 S SO O SO O O SO KK QQ       3 1 SO g O g 2 SO g Adding SO 3 increases the concentration [SO 3 ], so the numerator becomes too large. The reaction system is out of equilibrium, and will respond by decreasing the concentration in the numerator. The reaction is displaced to the “left”. By displacing the equilibrium to the left the system counters to some extent the addition of SO 3 (g). 4
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Lec-12-Chap14-4-b 9/29/2009 Chemical Equilibrium. Round-up 3 Shift of a Chemical Equilibrium Le Chatelier’s Principle c) We reduce the volume of the system to a half.
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Lec-12-Chap14-4-b - Lec-12-Chap14-4-b 9/29/2009 Lec-12:...

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