Definition Of Rate Law

Rate law is defined as the law which is used for studying the relationship between the rate of reaction and the concentration of the reactants.

Following are the ways to determine the rate law:

  • Isolation method: In this method, rate law is determined by considering the reactants in large quantities except for one.

For example, consider the following reaction:

A + B → C

Where [B] is taken in large quantity and is assumed that the concentration of b is constant, then the rate law becomes:

v = k’ [A]

k’ = k [B]0

The above equation is known as pseudo first-order rate law. Isolation method helps to determine the dependance of rate of the concentration of each reactant.

  • Method of initial rate: In this method, the reaction rate is measured for different concentration of reactants at the beginning of the reaction.

log v = log k + a log [A]0


v0 is the initial rate and [A]0 is the initial concentration of A

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