alleryStart learning →Under Henry's law, halving the pressure of a gas above a liquid changes the dissolved quantity to:
ATwice the original
BFour times as much
CThe same amount
DHalf the original
Answer & Solution
Correct answer: D. Half the original
1. Henry's law is a direct proportion, so the arithmetic is simple.
2. The quantity of an ideal gas dissolving in a definite volume of liquid is directly proportional to pressure.
3. Direct proportion means the quantity scales with pressure by the same factor.
4. Halving the pressure therefore halves the dissolved quantity.
5. That is why a drink goes flat once its container is opened.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 11 'Solutions and Colloids', sections 11.1-11.5_
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