Converting Between Kp and Kc

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Rian Montagh 2K
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Converting Between Kp and Kc

Postby Rian Montagh 2K » Wed Jan 16, 2019 11:14 am

I'm confused about how to convert between Kp and Kc and when you would need to do it?

Arianna Ko 2E
Posts: 33
Joined: Fri Sep 28, 2018 12:20 am

Re: Converting Between Kp and Kc

Postby Arianna Ko 2E » Wed Jan 16, 2019 11:16 am

I believe is just depends on the information that is given in the problem. If you are given equilibrium pressure values, use Kp and if given equilibrium concentration values, use Kc. They each give you the equilibrium constant, K.

megan blatt 2B
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

Re: Converting Between Kp and Kc

Postby megan blatt 2B » Wed Jan 16, 2019 11:48 am

Going off of the previous comment, they are both K constants and calculated the same way. Kp is used for gases and Kc is used for aqueous solutions and concentrations. When doing Kp, you use partial pressures of gases. If you are given the concentration of the gases instead of the partial pressures, you convert form concentration to partial pressure using PV=nRT.

Samantha Chang 2K
Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

Re: Converting Between Kp and Kc

Postby Samantha Chang 2K » Wed Jan 16, 2019 12:24 pm

When converting to Kp and Kc, you use the ideal gas law, P=concRT, and you use the concentrations given to find pressure in atm.


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