## Pseudo-Rate Law

$aR \to bP, Rate = -\frac{1}{a} \frac{d[R]}{dt} = \frac{1}{b}\frac{d[P]}{dt}$

Wilson 2E
Posts: 100
Joined: Sat Aug 17, 2019 12:18 am

### Pseudo-Rate Law

When calculating the rate of a multi-reactant reaction, why is it necessary to find the pseudo rate and increase the concentrations of all of the reactants but one?

Bilal Pandit 1J
Posts: 98
Joined: Wed Sep 11, 2019 12:16 am

### Re: Pseudo-Rate Law

You essentially assume that all the other reactions happen significantly faster than all of the other reactions, so there is a buildup of product of the reaction before and reactant after, as that single slow step is what limits the entire overall reaction.

Noe BM 1J
Posts: 50
Joined: Sat Sep 07, 2019 12:17 am

### Re: Pseudo-Rate Law

If the concentration of one reactant is small and the concentration of the other reactant(s) is large, the reaction rate will depend on the reactant with small concentration, so the reaction is easier to study.

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