What is the unit of rate constant for a zero order reaction?


A zero-order reaction is a chemical reaction wherein the rate does not vary with the increase or decrease in the concentration of the reactants. Therefore, the rate of these reactions is always equal to the rate constant of the specific reactions.

The Differential form of a zero-order reaction can be written as:

\(Rate = -\frac{dA}{dt}=k[A^{0}] = k\)


  • The rate refers to the rate of the reaction
  • k is the rate constant of the reaction.

The unit of the rate constant in a zero-order reaction is given by concentration/time or M/s  where ‘M’ is the molarity and ‘s’ refers to one second.

∴ Unit of rate constant k = mol L-1s-1

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