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Unformatted text preview: . nSO3 Kc = 2 2 Disturbing Reaction Mixtures at Equilibrium Effect of Changing the Temperature Endothermic reactions reactions K increases as temperature is raised Immediately after the temperature of a system at equilibrium is raised, Q < K A new equilibrium condition would be attained by net reaction of reactants to products. [SO [SO3] nSO3 V = = V 2[O ] 2 2 [SO2] 2 nSO2 nO2 nSO2 nO2 V V The opposite is the case for exothermic reactions Consistent with Le Chatelier’s principle 8 Disturbing Reaction Mixtures at Equilibrium Effect of Temperature on Equilibrium Raising the temperature of an equilibrium mixture shifts the equilibrium condition in the mixture shifts the equilibrium condition in the direction of the endothermic reaction. Lowering the temperature causes a shift in the direction of the exothermic reaction. Effect of Changing the Temperature The tubes in the photograph both contain gaseous NO2 (brown) and N2O4 (colourless) at equilibrium. • K is larger near 0 °C (right), so the system contains relatively high concentration of the colourless...
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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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