Rate law are differential equation , there for their is need to integrate them find the concentration as the function of time

✅ Correct.

Differential rate laws express the rate of reaction in terms of the instantaneous change in concentration over time ($\frac{d[\text{A}]}{dt}$). Integrating these differential equations allows us to derive the integrated rate laws, which provide a relationship between the concentration of reactants and time. This is crucial for predicting reactant concentrations at any given time or determining the time required for a certain amount of reactant to be consumed.