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We don't include solids and liquids in equilibrium constants because they don't affect the reaction reaching equilibrium. Equilibrium constants depend on the pressure of gases and concentrations of aqueous solutions in the reaction.
Solids and liquids like water are not included in the equilibrium calculation. Only gas or aqueous in the reaction are counted for. This is the same rule that applies when using the ICE tables and even with Le Chatelier's Principle because changes in the concentration of a liquid or a solid DO NOT affect or create a shift in the direction of a reaction.
This is how I've been applying it, but correct me if I'm wrong: Solids and liquids are not included in equilibrium constants. Aqueous elements (aq) are included to find Kc, and gases (g) are included to find Kp.
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