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Solids and liquids are not included in the K expression because their concentrations stay constant throughout the reaction. Therefore, they do not affect the reactant amount at equilibrium in the reaction. Hope that helps!
Kevin Ru 1C wrote:their concentrations stay constant throughout the reaction.
Their concentrations do change, however the amount they change is negligible in comparison to how abundant they were to begin, so we ignore them. Imagine taking $10 from a billionaire.
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