solving for equilibrium constants

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Noh_Jasmine_1J
Posts: 71
Joined: Fri Sep 28, 2018 12:15 am

solving for equilibrium constants

Postby Noh_Jasmine_1J » Wed Jan 09, 2019 4:19 pm

when solving for the equilibrium constant using gases, can you use either mol/L or in bar?

Seohyun Park 1L
Posts: 73
Joined: Fri Sep 28, 2018 12:29 am

Re: solving for equilibrium constants

Postby Seohyun Park 1L » Wed Jan 09, 2019 4:39 pm

You can use either, but sometimes they state explicitly to find Kc (concentration) or Kp (pressure) or they give the equilibrium constant in those two forms. If they give Kc, you have to use concentration and if they give Kp you have to use pressure.

EllerySchlingmann1E
Posts: 76
Joined: Fri Sep 28, 2018 12:24 am

Re: solving for equilibrium constants

Postby EllerySchlingmann1E » Wed Jan 09, 2019 4:58 pm

If the gas is in a reaction with other aqueous solutions whose equilibrium concentrations are given as concentrations, you may need to convert the partial pressure of your gas to a concentration using the ideal gas equation. In a reaction, you want to use all pressures or all concentrations, not a mixture.

Saman Andalib 1H
Posts: 73
Joined: Fri Sep 28, 2018 12:16 am

Re: solving for equilibrium constants

Postby Saman Andalib 1H » Wed Jan 09, 2019 5:07 pm

It depends upon if the question initially gives you a Kc value, for which you would have to use concentration measurements, or if the problem gives a Kp value, for which you would use partial pressure measurements.


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