Law of mass action and Rate constant

It is the rate at which a substance reacts is directly proportional to its active mass and the rate at which a reaction proceeds is proportional to the product of the active masses of the reacting substances.

         · For a reaction, aA + bB → product

Rate   ;

Here k is called the rate constant or velocity constant.

When [A] = [B] = 1 mol/litre, , then dx/dt=k

Therefore, rate constant k is also called specific reaction rate.

         · The value of rate constant depends on, the nature of reactant, temperature and catalyst. It is not dependent on the concentration of the reactants.

• Unit of rate constant  

         Where n= order of reaction.

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