Equilibrium costant

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melissa_dis4K
Posts: 106
Joined: Fri Sep 28, 2018 12:28 am

Equilibrium costant

Postby melissa_dis4K » Mon Jan 21, 2019 3:32 pm

In the following question I did not understand why they used both concentration and partial pressure for the equilibrium constant. I thought that you only used either concentrations or partial pressures, not both. Can someone explain to me please? This is from the sixth edition.
Self-Test 11.2A Write the equilibrium constant for the equilibrium between atmospheric
oxygen and oxygen dissolved in water, O2(g) <----> O2(aq)
[Answer: K " [O2] /PO2]
thank you!

armintaheri
Posts: 68
Joined: Fri Sep 28, 2018 12:26 am

Re: Equilibrium costant

Postby armintaheri » Mon Jan 21, 2019 3:37 pm

When all your reagents are gases, you can choose whether to use partial pressures or concentrations. But in this case, you have a gas on one side and an aqueous reagent on the other. You obviously can't convert the aqueous concentration to a partial pressure since it's not a gas. And you can't convert the partial pressure to a concentration since you don't have a known volume. So the only way to do the problem is to use both partial pressure and concentration.

melissa_dis4K
Posts: 106
Joined: Fri Sep 28, 2018 12:28 am

Re: Equilibrium costant

Postby melissa_dis4K » Mon Jan 21, 2019 3:59 pm

I see.. thank you so much!


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