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### Equilibrium constant

Posted: Sun Jan 13, 2019 7:41 pm
How come pressure does not affect Kc? It does affect Kp right?

### Re: Equilibrium constant

Posted: 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.

### Re: Equilibrium constant

Posted: 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

### Re: Equilibrium constant

Posted: Sun Jan 13, 2019 10:00 pm
Kp is dealing with the pressure not essentially the concentration like Kc is

### Re: Equilibrium constant

Posted: 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.

### Re: Equilibrium constant

Posted: 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.

### Re: Equilibrium constant

Posted: 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.