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The equilibrium constant is also unaffected by changes in pressure. As a rule, changes in concentration and pressure do not affect K, and changes in temperature do affect K. If the reaction is endothermic, production formation is favored, and if the reaction is exothermic, reactant formation is favored.
There is a temperature associated with every K value, which is what allows us to use the K value for all reactions at a given temperature. But, when the temperature changes, we must use the K value associated with that new temperature.
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