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Pure liquids and pure solids are able to react in chemical reactions. Therefore, I do not completely understand the reason why pure liquids and pure solids are not contained in the equilibrium constant. Can someone explain this to me?
Pure liquids and pure solids are not included in equilibrium constant expression because their densities (and, therefore, concentrations) are constant, so they do not affect the reactant/product amount at equilibrium.
The activities of pure liquids and solids are technically included in the equilibrium constant, but their activities do not change during the reaction, so the value of 1 is accurately used for their activities (or concentrations).
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