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Pressure and concentration do not permanently alter the equilibrium ratio of products to reactants because the reaction will simply shift in response to produce more of the reactants or products until K is once again achieved. Temperature, however, permanently alters K and I believe it is because temperature impacts the energy of a reaction. There is a certain amount of activation energy needed for products to be formed, and there is a certain amount of energy produced along with the products. With a change in temperature, these energies change and thus the way the reaction occurs shifts along with K.
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