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### Value of Kc and Kp

Posted: Thu Jan 09, 2020 10:54 am
Will the value of the equilibrium constant be the same regardless if we calculate it using the equilibrium concentrations or the equilibrium pressures?

### Re: Value of Kc and Kp

Posted: Thu Jan 09, 2020 11:07 am
The value of the equilibrium constant when calculating using concentration versus pressure should be the same. I believe the constant only changes if you alter the temperature of the reaction but when alternating between concentration and pressure, the constant should remain the same.

### Re: Value of Kc and Kp

Posted: Thu Jan 09, 2020 11:09 am
I also believe that they should be the same but I am not 100% sure. I think they should be tho since the equations only have to do with the relationship between the ratios of Products to Reactants.

Can someone please explain to me how to ask a question on Chem Community. I cannot figure it out. Thanks

### Re: Value of Kc and Kp

Posted: Thu Jan 09, 2020 1:07 pm
Yes, the equilibrium constant should be the same regardless if we calculate it using the equilibrium concentrations or the equilibrium pressures.

### Re: Value of Kc and Kp

Posted: Thu Jan 09, 2020 1:47 pm
Bryce Barbee wrote:Can someone please explain to me how to ask a question on Chem Community. I cannot figure it out. Thanks

Go back one page and scroll to the top. You should see a "new topic" button with a star next to it

### Re: Value of Kc and Kp

Posted: Thu Jan 09, 2020 1:53 pm
Wait I don't think Kc will equal to Kp since they are technically measuring different things. One is concentration while the other is partial pressure. When I looked it up it says that Kc will not always equal to Kp. The only time Kc and Kp are going to be equal is if the number of gas molecules on the product side is the same as the number of gas molecules on the reactant side.

### Re: Value of Kc and Kp

Posted: Thu Jan 09, 2020 2:50 pm
Kp and Kc are measuring different relationships within a reaction, but are both equilibrium constants. This is just dependent on the nature of the reactants and the products. The K constant in both cases will have no units anyway, so there isn't much to worry about there but more about the concept in general.