Kp and Kc

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Emily Orozco L4
Posts: 45
Joined: Fri Sep 28, 2018 12:29 am

Kp and Kc

Postby Emily Orozco L4 » Sun Jan 12, 2020 5:32 pm

If Kp is used for partial pressure and Kc is used for concentration, can there ever be an instance in which a reaction has both aq and g? If not, why not? If so, would you use Kc or Kp?

Jasleen Kahlon
Posts: 52
Joined: Wed Nov 21, 2018 12:19 am

Re: Kp and Kc

Postby Jasleen Kahlon » Sun Jan 12, 2020 5:49 pm

aq and g are state symbols. If a reaction has multiple sate symbols, it is heterogeneous, so yes, it can occur. If the state symbols are the same, it is a homogeneous reaction. Kp and Kc are just measures of concentration or pressure, so it depends what you are looking for in the reaction.

Dan M -3E
Posts: 101
Joined: Wed Sep 18, 2019 12:19 am

Re: Kp and Kc

Postby Dan M -3E » Sun Jan 12, 2020 8:20 pm

You can use PV=nRT to convert between partial pressure and concentration for a gas so that you make sure all the units are the same.

kendal mccarthy
Posts: 109
Joined: Wed Nov 14, 2018 12:22 am

Re: Kp and Kc

Postby kendal mccarthy » Sun Jan 12, 2020 10:25 pm

Yes, a reaction may occur with both aqueous and gaseous solutions. Depending on the question and data given that could help decide whether to use Kp or Kc.

Sofia Barker 2C
Posts: 101
Joined: Wed Sep 18, 2019 12:21 am

Re: Kp and Kc

Postby Sofia Barker 2C » Mon Jan 13, 2020 12:07 am

Yes, there could be an instance in which a reaction includes reactants or products that are in (aq) and (g) states. If so, you would need to convert partial pressure to concentration through PV = nRT. This equation can be manipulated to n/V = P/RT, in which n/V is molar concentration.

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