Kp and Kc


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Dang Lam
Posts: 55
Joined: Thu Jul 27, 2017 3:01 am

Kp and Kc

Postby Dang Lam » Fri Nov 24, 2017 3:04 pm

What is the differences between Kp and Kc? Can someone help?

Suchita 2I
Posts: 59
Joined: Fri Sep 29, 2017 7:04 am

Re: Kp and Kc

Postby Suchita 2I » Fri Nov 24, 2017 3:18 pm

Kc and Kp are both equilibrium constants used for gas-phase mixtures. However while Kc uses molar concentration of the gases, Kp uses partial pressure of the gases involved.

Girija_3E
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Re: Kp and Kc

Postby Girija_3E » Fri Nov 24, 2017 4:27 pm

While this is not a difference, also keep in mind that you calculate both of them the same way, with the products on the top and the reactants on the bottom!

AtreyiMitra2L
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Re: Kp and Kc

Postby AtreyiMitra2L » Fri Nov 24, 2017 9:35 pm

The former is referring to the partial pressures and the latter is referring to molarity. You use the former with gases and the latter with gases and aqueous solutions.

Katherine Jordak 1H
Posts: 51
Joined: Fri Sep 29, 2017 7:05 am

Re: Kp and Kc

Postby Katherine Jordak 1H » Mon Nov 27, 2017 9:00 am

Is it possible to use Kc when only gases are involved in the reaction? If so, how do you know when to use Kp and when to use Kc?

Katherine Jordak 1H
Posts: 51
Joined: Fri Sep 29, 2017 7:05 am

Re: Kp and Kc

Postby Katherine Jordak 1H » Mon Nov 27, 2017 9:03 am

Is it possible to use Kc when only gases are involved in the reaction? If so, how do you know when to use Kp and when to use Kc?

Ashley Fallon 3C
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Re: Kp and Kc

Postby Ashley Fallon 3C » Sun Dec 03, 2017 5:23 pm

Kc uses molar concentrations while Kp uses the partial pressures of gasses inside the closed system

Yuting Zhu 3D
Posts: 17
Joined: Tue Oct 10, 2017 7:14 am

Re: Kp and Kc

Postby Yuting Zhu 3D » Sun Dec 03, 2017 10:12 pm

I think it just depends on the facts you are given in the problem. When you are given concentrations of gases, you are using Kc, while if you are given the partial pressures, then you should use Kp.


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