In a reaction that involves more than one step, the step that has the highest energy transition state is the slowest step. This step has the greatest effect on the overall reaction and is called the rate determining step of the reaction.
What is the slowest step in a reaction mechanism?
The rate-determining step is the slowest step in a reaction mechanism. The rate-determining step determines the rate law for the overall reaction by limiting the overall rate.
Why is the slowest step used to determine the rate?
This is because the slowest step takes longer to complete... as there may be multiple other processes involved. For example, a reactant may need to diffuse or migrate to a specific reaction site before another reaction can occur, resulting in the instant production of a product.
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