## Pre-Equilibrium Approach

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

Ryan Danis 1J
Posts: 66
Joined: Fri Sep 28, 2018 12:18 am

### Pre-Equilibrium Approach

For what type of question would I need to use the pre-equilibrium approach? I did not encounter any book problems where I had to use it.

caseygilles 1E
Posts: 73
Joined: Fri Sep 28, 2018 12:18 am

### Re: Pre-Equilibrium Approach

We use the pre equilibrium approach when the reaction is a fast step followed by a slow step. For pre equilibrium we assume the reaction before the rate limiting step is at equilibrium so we use K. This approach works because there is a bottle neck and a buildup of intermediate which results in the first step at equilibrium

klarratt2
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

### Re: Pre-Equilibrium Approach

If you want practice with it, you have to use this approach in 7.23 (b) (7th edition) to find the rate law.

Mya Majewski 1L
Posts: 89
Joined: Fri Sep 25, 2015 3:00 am

### Re: Pre-Equilibrium Approach

Also in 15.89 for the 6th edition book.