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Pre-equilibrium approach

Posted: Wed Mar 13, 2019 5:24 pm
by Layal Suboh 1I
When do we use the pre-equilibrium approach?

Re: Pre-equilibrium approach

Posted: Wed Mar 13, 2019 7:02 pm
by Fayez Kanj
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 :)

Re: Pre-equilibrium approach

Posted: Wed Mar 13, 2019 8:19 pm
by shouse1f
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?

Re: Pre-equilibrium approach

Posted: Wed Mar 13, 2019 8:25 pm
by Gary Qiao 1D
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.

Re: Pre-equilibrium approach

Posted: Thu Mar 14, 2019 9:05 pm
by shouse1f
Thanks!