Equilibrium constant

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Valeria Viera 1B
Posts: 60
Joined: Fri Apr 06, 2018 11:05 am

Equilibrium constant

Postby Valeria Viera 1B » Sun Jan 13, 2019 7:41 pm

How come pressure does not affect Kc? It does affect Kp right?

Jaira_Murphy_2D
Posts: 31
Joined: Fri Apr 06, 2018 3:00 am

Re: Equilibrium constant

Postby Jaira_Murphy_2D » Sun Jan 13, 2019 8:26 pm

Kc is just referring to calculating the eq of given concentrations and Kp refers to calculating the eq of given pressures.

Angela Grant 1D
Posts: 67
Joined: Fri Sep 28, 2018 12:25 am

Re: Equilibrium constant

Postby Angela Grant 1D » Sun Jan 13, 2019 9:59 pm

Technically, it affects both since pressure and concentration are related by PV=nRT --> P=(concentration)RT <--> concentration=P/RT
But yes Kp is pressure and Kc is concentration

405021651
Posts: 46
Joined: Tue Nov 14, 2017 3:03 am

Re: Equilibrium constant

Postby 405021651 » Sun Jan 13, 2019 10:00 pm

Kp is dealing with the pressure not essentially the concentration like Kc is

Celeste 1I
Posts: 44
Joined: Fri Sep 28, 2018 12:18 am

Re: Equilibrium constant

Postby Celeste 1I » Sun Jan 13, 2019 10:04 pm

Just as a note Kp can only be used when talking about gases. Not sure if that helps. The partial pressure or concentration can be used depending on which is given.

Yiting_Gong_4L
Posts: 69
Joined: Fri Sep 28, 2018 12:25 am

Re: Equilibrium constant

Postby Yiting_Gong_4L » Mon Jan 14, 2019 12:04 am

Kp and Kc both give the equilibrium constant, but Kp is for partial pressure and Kc is for concentration.

Laurence Tacderas 1K
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

Re: Equilibrium constant

Postby Laurence Tacderas 1K » Mon Jan 14, 2019 9:28 am

Partial pressures of the reactant and products affect Kp, not Kc. Changing the pressure by reducing the volume can affect both Kp and Kc.


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