## Pre-equilibrium approach

$K = \frac{k_{forward}}{k_{reverse}}$

Layal Suboh 1I
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

### Pre-equilibrium approach

When do we use the pre-equilibrium approach?

Fayez Kanj
Posts: 62
Joined: Fri Sep 28, 2018 12:18 am
Been upvoted: 1 time

### Re: Pre-equilibrium approach

Hello!

We use the pre-equilibrium approach when doing problems with mechanisms, if the observed rate expression and the rate expression you obtain from the mechanisms do not match. You can make the arrow and equilibrium sign for the fast step, determine the expression of the equilibrium constant K, the substitute that back into the rate order you found out to make it the same as the observed rate.

Hope this helps :)

shouse1f
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

### Re: Pre-equilibrium approach

I know Lavelle mentioned the steady state approach but only went over the pre-equilibrium, so is the pre-equilibrium approach the only one we are expected to know?

Gary Qiao 1D
Posts: 66
Joined: Fri Sep 28, 2018 12:26 am

### Re: Pre-equilibrium approach

shouse1f wrote:I know Lavelle mentioned the steady state approach but only went over the pre-equilibrium, so is the pre-equilibrium approach the only one we are expected to know?

Yep, he said that we are only required to know the pre-equilibrium one.

shouse1f
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

Thanks!