Lesson_18 - The reaction quotient Consider the general...

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Lesson 18 The reaction quotient Consider the general reversible chemical reaction ( not in chemical equilibrium ): a A + b B = c C + d D The initial concentrations of reactants and products are b init B a init A d init D c init C p b init a init d init c init c P P P P Q B A D C Q = = ; ] [ ] [ ] [ ] [ The definitions of Q c and Q p are analogous to the definitions of K c and K p but Q c and Q p are calculated for a set of non-equilibrium concentrations
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Lesson 18 Q c and direction of change • If Q c = K c : Chemical equilibrium Product and reactant concentrations do not change • If Q c < K c : Reactants are in excess Reactant concentrations will decrease and product concentrations will increase • If Q c > K c : Products are in excess Product concentrations will decrease and reactant concentrations will increase
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Lesson 18 Q c and direction of change
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Lesson 18 Example 1 2
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Lesson 18 Example 2 Consider the equilibrium
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Lesson 18 Altering equilibrium conditions Le Chatelier’s principle: If a system in equilibrium is disturbed by changing the concentration of the reactants, pressure or temperature, it will react in such a way as to minimize the effect of the disturbance
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This note was uploaded on 04/13/2009 for the course CHEMISTRY 102 taught by Professor Soares during the Spring '09 term at Waterloo.

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Lesson_18 - The reaction quotient Consider the general...

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