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Kc to Kp Conversion

Posted: Tue Nov 28, 2017 1:02 pm
by RuchaDeshpande1L
Will we need to know how to convert values of Kc to values of Kp, and vice versa? If so, how do we do this? Do you need to use the Ideal Gas Law (PV=nRT)? There were a few problems like this on a worksheet my TA gave me, so I just wanted to clarify.

Re: Kc to Kp Conversion

Posted: Tue Nov 28, 2017 1:07 pm
by Salman Azfar 1K
I am not sure as to whether or not we will need to know how to do this, but basically you need to use the ideal gas law. If given pressure to get Kc, you need to put pressure into the ideal gas law and calculate the unknown values (most likely moles). Then use those moles to get concentrations and calculate Kc. There are more specific ways to describe this, but that is the basic way.

Re: Kc to Kp Conversion

Posted: Tue Nov 28, 2017 1:07 pm
by Sammy Thatipelli 1B
On one of the chemical equilibrium models, there are questions that Dr. Lavelle wrote that ask you to convert concentrations to pressures and vice versa. Yes, you would use the equation PV=nrt, and know that concentration is equal to P/rt. I would definitely study this because it was one the module post assessments

Re: Kc to Kp Conversion

Posted: Tue Nov 28, 2017 3:21 pm
by Julia Meno 1D
When we say concentration = P/(RT), is "concentration" the molar concentration (Kc)?

Re: Kc to Kp Conversion

Posted: Tue Nov 28, 2017 5:57 pm
by Shannon Wasley 2J
The concentration would be in reference to the specific molar concentration of the compound whose partial pressure is being used in the equation.

Re: Kc to Kp Conversion

Posted: Wed Nov 29, 2017 8:58 am
by nanditasundarapandian1D
also concentration is n/v in the PV = nRT equation. That's why we are able to get a correlation between them.