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This is because the molar concentration of a pure substance (solid or liquid) does not change in a reaction. Dr. Lavelle also said that there is no such thing as a concentration of a pure solid or a liquid, therefore it is not included in the K expression.
you can think of liquids as solvents like H2O. molecules of a solvent can technically react but the vast majority of the solvent will stay a solvent which means there is no significant change in concentration. since there is not significant change, including the concentration of liquid would just cancel out because it will stay the same.
When trying to understand why liquids and solids are not included in the equilibrium constant, remember that the activity, which Dr. Lavelle discussed when going over equilibrium constants, of any solid or liquid in a reaction is equal to 1.
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