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What exactly do you mean by aqueous solution? From what I understand, we include ions in solution in equilibrium constants. However, pure liquids and solids are excluded because they have an activity of 1, and equilibrium constants are technically calculated with activity, not concentration.
Like other people said, solids are always excluded since they do not have a concentration while pure liquids are always excluded since they do not change concentrations. In terms of aqueous solutions, the solvent is not included, but the solutes are. You can tell the difference because solvents will be marked as a liquid (l) while dissolved solutes will be marked with (aq). Essentially, whenever you see a molecules with (g) or (aq), include it when calculating the equilibrium constant. Hope this helps!
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