Question

Why are pure solids and liquids not included in equilibrium?

Answer 1

This is because they donot affect the reactant amount atequilibrium in the reaction, so they are disregarded 

Answer 2

Pure solids and liquids are not included in the equilibrium constant expression. This is because they donot affect the reactant amount atequilibrium in the reaction, so they are disregarded and kept at 1. Remember that the activity, a, of any solid or liquidin a reaction is equal to 1