# Kc/Kp and changing temperature and pressure

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#1
So I know that only changing temperatures change Kc and Kp.

With change in pressure, I understand that the partial pressure/concentration term will change so it no longer equals Kp so then the system will change to re-establish equilibrium so it's at Kc/Kp again.

But with a change in temperature how do we know if Kc/Kp changes or if the concentration/pp term changes and then the system changes to re-establish equilibrium (as it does with pressure) so the term equals the original Kp/Kc?

I hope this makes sense? If not I can try and clarify. Thank you.
0
6 years ago
#2
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0
6 years ago
#3
(Original post by LeaX)
So I know that only changing temperatures change Kc and Kp.

With change in pressure, I understand that the partial pressure/concentration term will change so it no longer equals Kp so then the system will change to re-establish equilibrium so it's at Kc/Kp again.

But with a change in temperature how do we know if Kc/Kp changes or if the concentration/pp term changes and then the system changes to re-establish equilibrium (as it does with pressure) so the term equals the original Kp/Kc?

I hope this makes sense? If not I can try and clarify. Thank you.
I reckon it might be something to do with Le Chatelier's principle. When the temperature changes the equilibrium position shifts to minimise this change. This results in a different value of Kc.
0
6 years ago
#4
(Original post by LeaX)
So I know that only changing temperatures change Kc and Kp.

With change in pressure, I understand that the partial pressure/concentration term will change so it no longer equals Kp so then the system will change to re-establish equilibrium so it's at Kc/Kp again.

But with a change in temperature how do we know if Kc/Kp changes or if the concentration/pp term changes and then the system changes to re-establish equilibrium (as it does with pressure) so the term equals the original Kp/Kc?

I hope this makes sense? If not I can try and clarify. Thank you.
Why should concentrations change initially when you change K.

The change in temperature conditions brings about a thermodynamic change in K that results in changing concentrations.
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