## Slow or Fast Step

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

004932366
Posts: 31
Joined: Wed Nov 22, 2017 3:00 am

### Slow or Fast Step

How can you tell whether or not a step in a reaction mechanism is slow or fast? Or is this told ahead of time?

Posts: 77
Joined: Fri Sep 28, 2018 12:28 am
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### Re: Slow or Fast Step

Usually it will be explicitly stated, but if not you can tell which is the slow/fast step by looking at other information given.
For example, if a energy profile is given you want to pick the one with the lowest activation energy and that would be the fast step relative to the other.

Noh_Jasmine_1J
Posts: 71
Joined: Fri Sep 28, 2018 12:15 am

### Re: Slow or Fast Step

the reaction rate that matches the experimental rate is the slow step.

anthony_trieu2L
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

### Re: Slow or Fast Step

Most often the slow step will be given to you. If it is not, you can look at the overall rate law, which usually represents the rate determining step (slow step).