K and Kc

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Jacqueline Duong 1H
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

K and Kc

Postby Jacqueline Duong 1H » Sat Mar 16, 2019 9:05 pm

What is the difference between K and Kc, and when do we know to use which one?

Sara Lakamsani 4D
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

Re: K and Kc

Postby Sara Lakamsani 4D » Sat Mar 16, 2019 9:54 pm

K can be used interchangeably to refer to the equilibrium constant using partial pressures or concentration. Sometimes you will see Kp when using partial pressures or Kc when using concentrations. If there is no subscript, partial pressures are probably being used, but you should be able to tell based on the info they give you in the problem.

Sara Lakamsani 4D
Posts: 61
Joined: Fri Sep 28, 2018 12:29 am

Re: K and Kc

Postby Sara Lakamsani 4D » Sat Mar 16, 2019 9:57 pm

Hope this helps!

mbaker4E
Posts: 69
Joined: Fri Sep 28, 2018 12:26 am

Re: K and Kc

Postby mbaker4E » Sat Mar 16, 2019 10:00 pm

K and Kc can be the same thing, but Kc refers specifically to concentration while Kp refers to partial pressures.

lukezhang2C
Posts: 59
Joined: Fri Sep 28, 2018 12:18 am

Re: K and Kc

Postby lukezhang2C » Sun Mar 17, 2019 3:51 pm

K and Kc can mean similar things depending on the context of the problem, but Kp would mean partial pressures while Kc would mean concentration.

Gillian Ward 1F
Posts: 61
Joined: Fri Sep 28, 2018 12:27 am

Re: K and Kc

Postby Gillian Ward 1F » Sun Mar 17, 2019 3:58 pm

K and Kc are basically the same thing, except that Kc specifically means concentrations like Kp would refer to partial pressures.

paytonm1H
Posts: 74
Joined: Fri Sep 28, 2018 12:18 am

Re: K and Kc

Postby paytonm1H » Sun Mar 17, 2019 4:02 pm

Kc is the equilibrium constant with respect to the equilibrium concentrations. Kp is with respect to equilibrium partial pressures (for gases). K is one of these two.


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