Pressure Notation

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Priscilla Okaiteye
Posts: 61
Joined: Tue Nov 21, 2017 3:02 am

Pressure Notation

Postby Priscilla Okaiteye » Sun Jan 20, 2019 9:43 pm

When we are writing out the concentrations to find the k constant if not all the products and reactants are gases, do we still use the P notation?

arif_latif_2G
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

Re: Pressure Notation

Postby arif_latif_2G » Sun Jan 20, 2019 9:45 pm

If not all chemicals involved are gases, you probably should use molarity rather than partial pressure.

AnnaYan_1l
Posts: 96
Joined: Fri Apr 06, 2018 11:05 am
Been upvoted: 1 time

Re: Pressure Notation

Postby AnnaYan_1l » Sun Jan 20, 2019 10:30 pm

I think Kp is only used when the reaction only includes gases, so I would default to Kc

Tony Ong 3K
Posts: 63
Joined: Fri Sep 28, 2018 12:23 am

Re: Pressure Notation

Postby Tony Ong 3K » Sun Jan 20, 2019 10:33 pm

Kc is regarding molar concentrations whereas Kp is for homogeneous gas equilibria.

If in any case you're required to convert from Kp to Kc or vice versa, you can use the formula:
Kp=Kc(RT)^deltaN

MadelineHlobik
Posts: 33
Joined: Fri Sep 28, 2018 12:22 am

Re: Pressure Notation

Postby MadelineHlobik » Sun Jan 20, 2019 10:46 pm

When finding Kp, do you have to use a specific unit of pressure? Or can you use any?

Simran Rai 4E
Posts: 58
Joined: Fri Sep 28, 2018 12:17 am

Re: Pressure Notation

Postby Simran Rai 4E » Sun Jan 20, 2019 10:59 pm

Kp should not have any units because it is an activity. ^


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