Kp vs Kc usage

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zfinn
Posts: 106
Joined: Fri Aug 30, 2019 12:16 am

Kp vs Kc usage

Postby zfinn » Sun Jan 12, 2020 8:35 pm

how do we know when a problem wants us to use Kp versus when we should use Kc? thanks!

Hope Hyland 2D
Posts: 50
Joined: Wed Feb 20, 2019 12:16 am

Re: Kp vs Kc usage

Postby Hope Hyland 2D » Sun Jan 12, 2020 8:36 pm

I think if the problem is dealing with gases, or it gives partial pressures, then you should use Kp, and if it's talking about concentrations then use Kc.

AArmellini_1I
Posts: 107
Joined: Fri Aug 09, 2019 12:15 am

Re: Kp vs Kc usage

Postby AArmellini_1I » Sun Jan 12, 2020 8:37 pm

If it's talking about gases used Kp for partial pressure. If it's talking about aqueous solutions use Kc for concentration.

Ariana Iranmahboub1G
Posts: 114
Joined: Fri Aug 09, 2019 12:17 am

Re: Kp vs Kc usage

Postby Ariana Iranmahboub1G » Sun Jan 12, 2020 8:38 pm

In many cases, the question will ask to find Kc or Kp.The question may also give you partial pressures, so you would know you would need to find Kp and if it gives you concentration, you'll know you need to find the Kc. If you're in doubt, I think it should be fine if you simply write K.

Anokhi Patel 2B
Posts: 76
Joined: Fri Aug 09, 2019 12:17 am

Re: Kp vs Kc usage

Postby Anokhi Patel 2B » Sun Jan 12, 2020 8:40 pm

Kp is used for partial pressure and (bar) while Kc is used for concentration with mol/L.

RasikaObla_4I
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

Re: Kp vs Kc usage

Postby RasikaObla_4I » Sun Jan 12, 2020 8:42 pm

Kp is used when the products and reactants are in the gaseous phase. Kc is used when the products and reactants are in the aqueous phase, so they have a concentration.


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