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Henry's Law/Equilibrium Problem

by Bipolarity
Tags: henry, law or equilibrium
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Bipolarity
#1
Mar13-12, 11:43 PM
P: 783
1. The problem statement, all variables and given/known data
A closed rigid container contains distilled water
and [itex]N_{2}(g)[/itex] at equilibrium. Actions that would
inctease the concentration of [itex]N_{2}(g)[/itex] in the
water include which of the following?
I. Shaking the container vigorously
II. Raising the temperature of the water
III. Injecting more [itex]N_{2}(g)[/itex] into the container
(A) I only
(B) II only
(C) III only
(D) I and II only
(E) I, II, and III


2. Relevant equations
- Henry's law states that more pressure means more solubility but don't know if that works here.
- We could try Le chatelier's principle


3. The attempt at a solution
To be honest I'm not very sure what the question is asking. The answer happens to be choice (C) but I can't figure my way around it. When I answered it initially, I wrote down A but no clue why it should be C. Is the question asking about the solubility of nitrogen gas in the water, or something else? Surely if you add gas, the concentration of the gas must increase even if equilibrium tries to consume some of it, the net change of the gas's concentration will still be positive right? So I know that III is definitely true, but I can't seem to work out I and II. I feels right, since shaking it should increase pressure?

I appreciate any help on this question. Thanks!

BiP
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Borek
#2
Mar14-12, 03:26 AM
Admin
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P: 23,574
Shaking can speed up reaching equilibrium, but you are told you already are at the equilibrium, so shaking doesn't matter.

Solubility of gases lowers with temperature.


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