In an endothermic reaction, Keq increases as the temperature increases and vice versa.
In an exothermic reaction, Keq decreases as the temperature increases and vice versa.
- Keq is the equilibrium constant of a reaction.
- The equilibrium constant is independent of the concentrations of the reactants and products
- The only factor that the equilibrium constant depends on is the temperature of the system of reaction
- In an endothermic reaction, energy is gained
- So a higher temperature is more favourable in an endothermic reaction
- As a result, more products are formed at a higher temperature, leading to a higher value of Keq
- In an exothermic reaction, energy is released
- So a lower temperature is more favourable in an exothermic reaction
- As a result, fewer products are formed at a higher temperature, leading to a lower value of Keq
Therefore, the temperature is the only factor that affects the equilibrium constant of a reaction.
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