why is the concentration of a solid left out of the equilibrium expression for the solubility of a salt

Its concentration remains constant

Explanation:

The concentration of a pure solid is left out of the expression for the equilibrium solubility of a salt because the concentration of a pure solid remains constant. Therefore, the activity of a pure solid is 1.

Being of a constant concentration, the pure solid is not included in equilibrium expression for the solubility of a salt.

state the principle of separating two immiscible liquids by separating funnel. describe an activity with diagram to separate a mixture of water and kerosene oil. answer: immiscible layers separate out in layers depending on their densities in separating funne