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Question
Why do gases always tend to be less soluble in liquids as the temperature is raised?
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Solution
The solubility of a gas in a liquid at a particular temperature is directly proportional to the pressure of the gas in equilibrium with the liquid at that temperature. The dissolution of a gas in a liquid is an exothermic process, that is, it is accompanied by the evolution of heat. Thus,
\[\ce{Gas + Solvent <=> Solution + Heat}\]
Applying Le Chatelier’s principle, the increase of temperature would shift the equilibrium in the backward direction; that is, solubility would decrease. Therefore, gases always tend to be less soluble in liquids as the temperature is raised.
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