Page 1 of 1

Keq vs Kc

Posted: Tue Jan 07, 2020 12:03 pm
by Rita Chen 1B
Is Keq the same as Kc?
When do we use which?

Re: Keq vs Kc

Posted: Tue Jan 07, 2020 12:11 pm
by Paul Hage 2G
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.

Re: Keq vs Kc

Posted: Tue Jan 07, 2020 1:05 pm
by Wendy 1E
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.

Re: Keq vs Kc

Posted: Tue Jan 07, 2020 1:59 pm
by Ipsita Srinivas 1K
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. ?

Re: Keq vs Kc

Posted: Tue Jan 07, 2020 2:16 pm
by Maya Beal Dis 1D
When would we need to specify and use Kc as opposed to just using Keq?

Re: Keq vs Kc

Posted: Tue Jan 07, 2020 4:01 pm
by BNgo_2L
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.

Re: Keq vs Kc

Posted: Tue Jan 07, 2020 4:02 pm
by BNgo_2L
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.