Slow step of reactions


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Shirley Liu 2I
Posts: 64
Joined: Fri Sep 28, 2018 12:16 am

Slow step of reactions

Postby Shirley Liu 2I » Sun Mar 10, 2019 11:40 pm

We know that the slow step is the rate determining step, so if the first step is the slow step then the rate law is of that step is the overall rate law. However if the second or third step is the slow step would the overall rate law be just the rate law of that step or do we also take into account the rate law of the previous steps ?

Chris Dis3L
Posts: 45
Joined: Fri Sep 28, 2018 12:25 am

Re: Slow step of reactions

Postby Chris Dis3L » Sun Mar 10, 2019 11:47 pm

In kinetics, the rate of a reaction with several steps is determined by the slowest step, which is known as the rate-determining, or rate-limiting, step. Thus, the rate determining step determines the rate law

Tony Ong 3K
Posts: 63
Joined: Fri Sep 28, 2018 12:23 am

Re: Slow step of reactions

Postby Tony Ong 3K » Sun Mar 10, 2019 11:49 pm

Yes, always take into account the slowest step. The rate law would be the rate constant times the reactants of that step.

Sydney Tay 2B
Posts: 64
Joined: Fri Sep 28, 2018 12:20 am

Re: Slow step of reactions

Postby Sydney Tay 2B » Sun Mar 10, 2019 11:51 pm

The overall rate law of the reaction is dependent on the slowest reaction mechanism. So the overall rate law would be equal to the rate law of the slowest step regardless of the reaction rates of the other steps. Since the slowest step is the "bottleneck" for the whole reaction you only need to take into account the rate law of that step.


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