Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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State Henry’S Law. - Chemistry

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State Henry’s law.

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Solution 1

Henry’s law: The mass of a gas dissolved in a given volume of the liquid at constant temperature is directly proportional to the pressure of the gas present in equilibrium with the liquid.

Solution 2

Henry’s law relates solubility of a gas with external pressure. The law states that, “the
solubility of a gas in liquid at constant temperature is proportional to the pressure of
the gas above the solution”.

f S is the solubility of the gas in mol dm−3, then according to Henry’s law,

S ∝ P i.e. S = KP

where, P is the pressure of the gas in atmosphere, K is constant of proportionality and
has the unit of mol dm−3 atm−1.

Concept: Solubility - Solubility of a Gas in a Liquid
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