K constants

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Jasmin Argueta 1K
Posts: 69
Joined: Fri Sep 28, 2018 12:16 am

K constants

Postby Jasmin Argueta 1K » Fri Mar 15, 2019 1:03 am

In regards to K in chemical kinetics, when would we use big K and little k? are both needed only when using the pre-equilibrium approach? I know big K is products/reactants and little k is forward/reverse or k1/k1'. Is this the only instance we'll need to connect the two? I am asking because I usually make mistakes when using the same varibales so don't particularly favor these problems

Jonny Schindler 1A
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

Re: K constants

Postby Jonny Schindler 1A » Fri Mar 15, 2019 2:00 am

I think relating big K to the forward and reverse reactions is the only way to connect them.

Joonsoo Kim 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

Re: K constants

Postby Joonsoo Kim 4L » Fri Mar 15, 2019 10:49 am

I think you use big K to convert the concentration of an intermediate in terms of concentrations of species found in the experimentally determined rate law. You can then convert big K into little k's using K=(k/k') to get your rate law all in terms of concentrations and rate constants.

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