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Unformatted text preview: GENERAL CHEMISTRY Principles and Modern Applications PETRUCCI HERRING HERRING MADURA MADURA TENTH EDITION Reaction Mixtures in Dynamic Chemical Equilibrium Reversible Reactions BISSONNETTE BISSONNETTE Principles of Chemical Equilibrium 15 Ca2 (aq) 2 HCO- (aq) CaCO3 (s) CO2 (g) H2O(l) 3 Reaction Mixtures in Dynamic Chemical Equilibrium Reaction Mixtures in Dynamic Chemical Equilibrium Reversible Reactions Reversible Reactions Reversible chemical reactions can go in either direction, depending on the conditions depending on the conditions. Dynamic chemical equilibrium: a state in which the opposite reactions occur at equal rates so that there is no change of concentrations of species. Ca2 (aq) 2 HCO- (aq) 3 Net Reaction Ca2 (aq) 2 HCO- (aq) CaCO3(s) CO2 (g) H2O(l) 3 The change of concentrations of species due to unequal rates of the reactions in opposite directions, when the system is not at equilibrium. ⇌ CaCO3 (s) CO2 (g) H2O(l) 1 The Reaction Quotient and the Equilibrium Constant The Reaction Quotient and the Equilibrium Constant Reaction Quotient (Q) For a reaction represented by a A + b B ⇌ c C + d D Cc Dd Q A a Bb EXAMPLE : Reaction between hydrogen and iodine gases at 425 °C to produce hydrogen iodide gas H2 (g) + I2 (g) ⇌ 2HI (g) Initial (mol L-1 ) Concentration at time 1 (mol L-1 ) 0.0175 0.0150 0...
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This note was uploaded on 03/22/2011 for the course MAC AECH111 taught by Professor Cheresres during the Spring '11 term at McGill.

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