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Another way to think about this is that the equilibrium constant is the ratio between the products and the reactants. Since the concentration of a solid (since solids do not have a concentration) and the concentration of a pure liquid/solvent do not change, including them in the ratio would mean that the same value would be put in the numerator and denominator, thus causing them to cancel each other out. Hence, we just leave these out when calculating K.
Solids and liquids are not counted in the equilibrium constant because the concentration does not change in either the products or reactants. Therefore, yes only gases and aqueous solutions are included when trying to find K.
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