equilibrium constant (k) pure solids and liquids

[rlaboss]

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1. Is there such thing as an impure solid that would have to be included in the equilibrium constant equation?

2. If we have a mixture of two liquids reacting to produce a gas, would the liquids be considered impure and included in the equilibrium constant equation?

3. If "2" is true, is the only time we exclude a liquid from the equilibrium constant equation is when it is the only liquid on that side of the reaction?

Thank you