By generating a rate law is complicated when the rate-determining step is preceded by 'a' is a Equilibrium reaction.
The rate law shows about the rate of chemical reaction depends on reactant concentration.
According to rate law, the rate of reaction is directly proportional to the concentration of reaction which is raised to a stiochiometric coefficient which is determined experimentally.
Thus, from above we concluded that if the preceding reaction is an equilibrium, that compromises the simplicity of writing the rate law from the stiochiometry of the rate determining step will be used up in the reverse reaction of the equilibrium.
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