Keq vs Kc

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Rita Chen 1B
Posts: 112
Joined: Sat Jul 20, 2019 12:15 am

Keq vs Kc

Postby Rita Chen 1B » Tue Jan 07, 2020 12:03 pm

Is Keq the same as Kc?
When do we use which?

Paul Hage 2G
Posts: 105
Joined: Thu Jul 25, 2019 12:17 am

Re: Keq vs Kc

Postby Paul Hage 2G » Tue Jan 07, 2020 12:11 pm

Keq is the generalized equilibrium constant, whereas Kc is the equilibrium constant found using concentration values. You would use Kc when you are specifically calculating the equilibrium constant using the molarity values of each reactant/product.

Wendy 1E
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Re: Keq vs Kc

Postby Wendy 1E » Tue Jan 07, 2020 1:05 pm

Also relevant to this discussion is how Kc is different than Kp. Kp is the equilibrium constant found using partial pressures. The method of calculating Kp is essentially the same as Kc, except Kp is calculated by the partial pressure of products/the partial pressure of the reactants.

Ipsita Srinivas 1K
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Joined: Mon Jun 17, 2019 7:24 am

Re: Keq vs Kc

Postby Ipsita Srinivas 1K » Tue Jan 07, 2020 1:59 pm

Ok, just to clarify, Kc and Kp are just types of Keq, and you label the equilibrium constant depending on whether Keq is calculated using partial pressure or molar conc. ?

Maya Beal Dis 1D
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Re: Keq vs Kc

Postby Maya Beal Dis 1D » Tue Jan 07, 2020 2:16 pm

When would we need to specify and use Kc as opposed to just using Keq?

BNgo_2L
Posts: 95
Joined: Wed Sep 11, 2019 12:17 am

Re: Keq vs Kc

Postby BNgo_2L » Tue Jan 07, 2020 4:01 pm

Ipsita Srinivas 1K wrote:Ok, just to clarify, Kc and Kp are just types of Keq, and you label the equilibrium constant depending on whether Keq is calculated using partial pressure or molar conc. ?


Yes, Kc and Kp are both types of Keq, and Keq is labelled based on whether you use concentration or partial pressures.

BNgo_2L
Posts: 95
Joined: Wed Sep 11, 2019 12:17 am

Re: Keq vs Kc

Postby BNgo_2L » Tue Jan 07, 2020 4:02 pm

Maya Beal Dis 1D wrote:When would we need to specify and use Kc as opposed to just using Keq?


I believe we should use Kc any time we use concentrations to calculated Keq.


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