Do We Include the Liquid State When Finding K?

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SUMMARY

When determining the equilibrium constant K, the liquid state must be included in the calculations. While the solid state is excluded, the activities of liquids are relevant, particularly in aqueous reactions where they can often be approximated as 1. In cases involving near ideal liquid-liquid solutions or immiscible liquid mixtures, the molar concentration of the liquid can replace its activity, similar to the treatment of solutes in dilute solutions.

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higherme
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when finding K, do we include the liquid state? I know the solid state is not included
 
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It would help if you provide an example with your question.

If I'm interpreting it correctly, then the answer is yes. Strictly speaking, we need to account for activities of liquids in the reaction, but in certain cases, the activities are close to 1 (most any aqueous reaction) and may be ignored. When dealing with near ideal liquid-liquid solutions or with mixtures of immiscible liquids, the actual molar concentration of the liquid may be used in the place of its activity (the same substitution that is made for most solutes in dilute solutions).
 

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