Rate Law when Intermediates are in the Reactants

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Iley I_Nagast_2L
Posts: 81
Joined: Fri Sep 29, 2023 12:02 pm

Rate Law when Intermediates are in the Reactants

Postby Iley I_Nagast_2L » Fri Mar 15, 2024 12:04 am

I understand that the overall rate law of a reaction involves the reactants of the slowest step without intermediates, but how do you find the overall rate law when intermediates are in the reactants?

Peter Soliman 1J
Posts: 61
Joined: Fri Sep 29, 2023 10:13 am

Re: Rate Law when Intermediates are in the Reactants

Postby Peter Soliman 1J » Fri Mar 15, 2024 12:19 am

Hello!

You need to use the Pre-Equilibrium method to substitute the intermediate species with the reactants in the previous step that are typically assumed to be at equilibrium.

205975909
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Joined: Fri Sep 29, 2023 10:42 am
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Re: Rate Law when Intermediates are in the Reactants

Postby 205975909 » Fri Mar 15, 2024 12:21 am

When intermediates are present in the reactants, you typically eliminate them using pre-equilibrium approximation or steady-state approximation. After eliminating the intermediates, the overall rate law involves the reactants of the slowest step, excluding the intermediates, as in the case without intermediates.


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