Water as a liquid in a reaction

[Melody Haratian 2J]

If water was a liquid participating in a reaction but not the main solvent, would it still be included in the equilibrium equation for the equilibrium constant?

[Jayasree Peri 2J]

I don't think it would be, because it wouldn't be in the same state as the other reactants and products. Also, I'm not sure if water would be a liquid participating and not be the main solvent, but I might be wrong about that.

[Will Skinner]

If water is a solvent, then you would ignore it for the equilibrium expression. If water was in the same state as the others then you would include it in the equilibrium equatIon.

[Liam Bertrand 3]

If water is the main solvent it is not included.

[Silvi_Lybbert_3A]

Yes, I believe so. Almost always, water is the solvent in the reactions we have looked at and especially in biochemistry. However, when water is not the solvent and its concentration is not large enough for a change in its concentration to be negligible, we do include it in the equilibrium equation. After all, if a change in it would be significant so that the initial and final concentrations of water are not essentially equal, they would not cancel out and would contribute to the quotient or K value.