K, Kc and Kp

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mbaker4E
Posts: 69
Joined: Fri Sep 28, 2018 12:26 am

K, Kc and Kp

Postby mbaker4E » Thu Jan 10, 2019 3:11 pm

What are the differences in using K, Kc and Kp? Are K and Kc interchangeable?

Fiona Jackson 1D
Posts: 30
Joined: Fri Sep 28, 2018 12:22 am

Re: K, Kc and Kp

Postby Fiona Jackson 1D » Thu Jan 10, 2019 3:13 pm

I think K is a general term for the equilibrium constant, while Kc is used when using concentrations and Kp is used with pressures. So, Kc and Kp are both K constants, but are more specific.

Cynthia Aragon 1B
Posts: 47
Joined: Mon Apr 09, 2018 1:38 pm

Re: K, Kc and Kp

Postby Cynthia Aragon 1B » Thu Jan 10, 2019 3:17 pm

Kp stands for the partial pressure equilibrium constant
Kc stands for the molar concentration equilibrium constant

Ashley Zhu 1A
Posts: 69
Joined: Fri Sep 28, 2018 12:16 am

Re: K, Kc and Kp

Postby Ashley Zhu 1A » Thu Jan 10, 2019 3:19 pm

I think the way the textbook explains it is that K and Kp are essentially the same thing, using partial pressures for reactions that have gaseous compounds while Kc is specific to a K that uses concentrations.
Pages 424 and 437 in the 6th edition might be helpful if you want to look at it.

TiffanyL1G
Posts: 61
Joined: Fri Sep 28, 2018 12:22 am

Re: K, Kc and Kp

Postby TiffanyL1G » Thu Jan 10, 2019 3:29 pm

K is also known to be the composition of the reaction mixture at equilibrium at a given temperature. Kc is used for substances with concentration (Aqueous and or if there is more than one form in the chemical equation), and Kp is used for partial pressures that have gaseous compounds.

Kessandra Ng 1K
Posts: 67
Joined: Fri Sep 28, 2018 12:25 am

Re: K, Kc and Kp

Postby Kessandra Ng 1K » Thu Jan 10, 2019 11:34 pm

If you're referring specifically to homework questions, I believe most of them will say specifically which K/Kc/Kp they want.

Sapna Ramappa 1J
Posts: 63
Joined: Fri Sep 28, 2018 12:24 am

Re: K, Kc and Kp

Postby Sapna Ramappa 1J » Fri Jan 11, 2019 10:38 am

K is the generic term for the equilibrium constant, Kc is specifically for concentrations, and Kp is specifically for partial pressures.

Edward Suarez 1I
Posts: 75
Joined: Fri Sep 28, 2018 12:27 am

Re: K, Kc and Kp

Postby Edward Suarez 1I » Fri Jan 11, 2019 10:46 am

i believe you can use them interchangeably (most people use K only). C refers to concentration while P refers to partial pressure

Celine Hoh 2L
Posts: 66
Joined: Fri Sep 28, 2018 12:28 am

Re: K, Kc and Kp

Postby Celine Hoh 2L » Fri Jan 11, 2019 10:47 am

The K values are only affected by the change in temperature.


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