Kc vs Kp


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Mina Tadros 3L
Posts: 93
Joined: Wed Sep 30, 2020 9:38 pm

Re: Kc vs Kp

Postby Mina Tadros 3L » Sun Jan 10, 2021 10:56 pm

When you are given the concentration of the reactants and products, you use Kc. However, if you are given the partial pressures of the reactants and products, you would use Kp.

Gustavo_Chavez_1K
Posts: 92
Joined: Wed Sep 30, 2020 9:46 pm

Re: Kc vs Kp

Postby Gustavo_Chavez_1K » Sun Jan 10, 2021 10:58 pm

Kc is used when the concentrations of reactants and products are given for a solution. Kp is used when the partial pressure is given for a gas.

Anthony_Sandoval_1D
Posts: 91
Joined: Wed Feb 19, 2020 12:15 am

Re: Kc vs Kp

Postby Anthony_Sandoval_1D » Sun Jan 10, 2021 11:01 pm

Kc is used for concentration where Kp is used specifically for partial pressure.

RyanKopeikin_2I
Posts: 69
Joined: Fri Aug 30, 2019 12:17 am

Re: Kc vs Kp

Postby RyanKopeikin_2I » Tue Jan 12, 2021 9:22 pm

Kp = equilibrium constant using the equilibrium partial pressures for the reactants & products.
Kc = equilibrium constant using the equilibrium molar concentrations for the reactants & products.

Emerald Wong 1B
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Re: Kc vs Kp

Postby Emerald Wong 1B » Tue Jan 12, 2021 9:51 pm

Rachel Kho Disc 2G wrote:Also will we need to have the formula that converts Kc to Kp memorized? Or will that be given to us on an equations sheet?

The ideal gas law that converts concentration to pressure is easy to memorize! I'm not sure if that was what you were asking in terms of converting Kc to Kp.

Lorraine Medina 3E
Posts: 125
Joined: Wed Sep 30, 2020 10:11 pm

Re: Kc vs Kp

Postby Lorraine Medina 3E » Wed Jan 13, 2021 11:21 pm

Kc is used for concentrations while Kp is used for partial pressures. Hope this helps!

Akriti Ratti 1H
Posts: 95
Joined: Wed Sep 30, 2020 9:36 pm

Re: Kc vs Kp

Postby Akriti Ratti 1H » Wed Jan 13, 2021 11:24 pm

Kc is for concentration, while Kp is for partial pressure.

Nancy Yao
Posts: 62
Joined: Wed Sep 30, 2020 9:38 pm

Re: Kc vs Kp

Postby Nancy Yao » Sat Jan 16, 2021 5:49 am

Rachel Kho Disc 2G wrote:Also will we need to have the formula that converts Kc to Kp memorized? Or will that be given to us on an equations sheet?


Isn't that equation is PV=nRT?

Nina Fukui 2J
Posts: 96
Joined: Wed Sep 30, 2020 9:43 pm

Re: Kc vs Kp

Postby Nina Fukui 2J » Sat Jan 16, 2021 6:45 am

Kp is used when partial pressures are given and Kc is used when concentrations are given but they both are equilibrium constants!

Nan_Guan_1L
Posts: 92
Joined: Wed Sep 30, 2020 9:59 pm

Re: Kc vs Kp

Postby Nan_Guan_1L » Sat Jan 16, 2021 8:16 am

just to add on to the discussion above,
it also depends on what is given to you. if the question gave you conditions in barr or atm, then go for Kp. if the question gave you concentration, then go for Kc.


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