Question

Question 7.7 Explain why pure liquids and solids can be ignored while writing the equilibrium constant expression?

Class XI Equilibrium Page 225

Answer 1

While writting equilibrium constant we often ignore pure liquids and solids because the cocentration and volume of these substance are approx constant and does not vary.

Answer 2

molar concentration of a pure solid or liquid ( when it is in excess ) is constant . I mean it is independent of the amount present .

That's why pure liquid and solid can be ignored while writing the equilibrium constant expression.