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Pressure Notation

Posted: Sun Jan 20, 2019 9:43 pm
by Priscilla Okaiteye
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?

Re: Pressure Notation

Posted: Sun Jan 20, 2019 9:45 pm
by arif_latif_2G
If not all chemicals involved are gases, you probably should use molarity rather than partial pressure.

Re: Pressure Notation

Posted: Sun Jan 20, 2019 10:30 pm
by AnnaYan_1l
I think Kp is only used when the reaction only includes gases, so I would default to Kc

Re: Pressure Notation

Posted: Sun Jan 20, 2019 10:33 pm
by Tony Ong 3K
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

Re: Pressure Notation

Posted: Sun Jan 20, 2019 10:46 pm
by MadelineHlobik
When finding Kp, do you have to use a specific unit of pressure? Or can you use any?

Re: Pressure Notation

Posted: Sun Jan 20, 2019 10:59 pm
by Simran Rai 4E
Kp should not have any units because it is an activity. ^