Solids or liquids are not included in an equilibrium expression because:
A. the concentrations of liquids and solids are negligible
B. the volume of liquids and solids are constant and their constant value is incorporated into the value of the equilibrium constant, K.
C. the concentrations of liquids and solids vary tremendously and their concentrations are excluded in an equilibrium expression.
D. the concentrations of solids and liquids are constant and their constant value is incorporated into the value of the equilibrium constant, K.
