7.92. Describe the effect of change in temperature on a chemical equilibrium.
7.92. Describe the effect of change in temperature on a chemical equilibrium.
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1 Answer
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Whenever equilibrium is disturbed by change in the concentration, pressure or volume, the composition of the equilibrium mixture changes because the reaction quotient, Qc no longer equals the equilibrium constant, Kc. However, when a change in temperature occurs, the value of equilibrium constant, Kc is changed.
In general, the temperature dependence of the equilibrium constant depends on the signoff ΔH for the reaction.
- The equilibrium constant for an exothermic reaction (negative ΔH) decreases as the temperature increases.
- The equilibrium constant for an endothermic reaction (positive ΔH)increases as the temperature in
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