## Pre-Equilibrium Approach

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

Silvino Jimenez 1A
Posts: 52
Joined: Fri Sep 29, 2017 7:04 am

### Pre-Equilibrium Approach

When determining the Rate Law of a multiple step Reaction, what is the best way to determine which is the slow step? How do you find out if the step before it is in equilibrium, does the problem have to state it or does it have to do with A Big K value of [P]/[R] ?

DianaTrujillo2K
Posts: 40
Joined: Fri Sep 29, 2017 7:04 am

### Re: Pre-Equilibrium Approach

The problem will likely not tell you. You determine the slow step by finding the rates of every step starting in step 1. If the rate for step 1 does not match the overall rate law then it is not the slow step and you will have to check step 2. You go in order finding the rate laws of each elementary step until the one you get matches the one given.