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Horvath Practice Problems 38

# Horvath Practice Problems 38 - Q = C c D d A a B b(9.3 The...

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9 THE REACTION QUOTIENT AND LECHATELIER’S PRINCIPLE We have seen that the equilibrium constant is an important quantity. It turns out that one can extend the de fi nition of the equilib- rium constant to non-equilibrium situations. The Reaction Quotient Under non-equilibrium situations the ratio of the concentra- tion (or partial pressures) of products to reactants is called the reaction quotient, Q = [ products ] [ reactants ] . (9.1) So, for the reaction, aA + bB ­ cC + dD, (9.2) the reaction quotient is
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Unformatted text preview: Q = [ C ] c [ D ] d [ A ] a [ B ] b . (9.3) The reaction quotient applies to the current situation of the reaction and thus changes over the course of the reaction. Clearly, at equilibrium Q = K. Beyond that, however, if Q < K the reaction will proceed in the forward direction (make more products). And, if Q > K the reaction will proceed in the reverse direction (make more reactants). THE REACTION QUOTIENT AND LECHATELIER’S PRINCIPLE 37...
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