Kc and Kp

Moderators: Chem_Mod, Chem_Admin

Mariana Fuentes 1L
Posts: 43
Joined: Wed Nov 15, 2017 3:00 am

Kc and Kp

Postby Mariana Fuentes 1L » Sun Jan 13, 2019 1:38 pm

How do we know when to use Kc and Kp? During discussion our TA wanted us to do the homework based on Kc even though the state of the equation was g.

Raquel Ruiz 1K
Posts: 30
Joined: Tue Nov 14, 2017 3:02 am

Re: Kc and Kp

Postby Raquel Ruiz 1K » Sun Jan 13, 2019 1:43 pm

Dr. Lavelle said that we should do Kc because it is easier for us to solve based on concentration. It would be harder for us to solve Kp and covert. We should solve for Kp when it is asked of us in a question.

Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

Re: Kc and Kp

Postby anthony_trieu2L » Sun Jan 13, 2019 1:44 pm

You use Kc or Kp based on the information that is given and what the question is asking for. For example, if you are given gases and their molar concentrations, you can use Kc. However, if the question requires you to calculate Kp, use the Ideal Gas Law to convert Kc to Kp.

Jason Ye 2I
Posts: 33
Joined: Fri Sep 28, 2018 12:22 am

Re: Kc and Kp

Postby Jason Ye 2I » Sun Jan 13, 2019 2:48 pm

You use Kp for gases and when pressure can be involved and Kc for aqueous solutions where mostly only concentration is concerned.

Venya Vaddi 1L
Posts: 96
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 2 times

Re: Kc and Kp

Postby Venya Vaddi 1L » Sun Jan 13, 2019 2:50 pm

Use Kp when even partial pressures and Kc when given concentrations. You can convert using PV=nRT and can also convert between Kp and Kc but that is more complicated, but is necessary when you are given Kp and concentration values (or the other way around).

Jonathan Pai 2I
Posts: 121
Joined: Fri Sep 28, 2018 12:27 am

Re: Kc and Kp

Postby Jonathan Pai 2I » Sun Jan 13, 2019 2:52 pm

Use the one your given, don't use the one your not given.

Return to “Equilibrium Constants & Calculating Concentrations”

Who is online

Users browsing this forum: No registered users and 2 guests