why active mass of solid is taken 1???????????

Dear anuj,

For unit concentration of reactants rate of the reaction is equal to rate constant or specific reaction rate.

            At equilibrium the rate of both forward and backward reactions become equal and after achieving equilibria, the concentration of reactants and products remains constant as shown in figure.

         Active mass is the molar concentration of the reacting substances actually participating in the reaction.

            Active mass = number of moles/volume in litres

            and Active mass of solid is taken as unity.

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Sagar Singh

B.Tech IIT Delhi

sir i know what is mean by active mass

but i hav doubt that for solids why it is taken unity[1]????????????????????