Question

state Henry's law , why do gases always tend to be less soluble in liquids as the temperature is raised?

Answer 1

Henry's law states that the mass of a gas dissolved per unit volume of the solvent at a given temperature is proportional to the pressure of the gas in equilibrium with the solution. The solubility of a gas in a liquid is directly proportional to the pressure of the gas. 

Answer 2

Solubility of gases in liquids decreases with an increase in temperature. This is because dissolution of gases in liquids is an exothermic process.

Gas+liquid---->solution +heat

Therefore, when the temperature is increased, heat is supplied and the equilibrium shifts backwards, thereby decreasing the solubility of gases.
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