What is meant by active mass Why the active mass of pure solid or liquid taken to be 1 - Chemistry - Equilibrium

Question

What is meant by active mass? Why the active mass of pure
solid or liquid taken to be 1?

Shubhangini Kumari · Accepted Answer

Dear student!Active mass is the molar concentration of the
reacting substance which actually participate in the reaction so
as,
Active mass = no of moles/ Volume in L
Actually, when we talk about pure solid or liquid, they exist in
reaction only when the equilibrium is present and at the
equilibrium condition there is no net change in the concentration
of the substances so that the concentration terms become constant
and hence it is taken as unity

What is meant by active mass? Why the active mass of pure solid or liquid taken to be 1?

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