Question

Gases tend to be less soluble in liquids as the temperature is raised.Why?

Answer 1

Gases have large inter-molecular spaces between their molecules. When gases are added to liquids the molecules of liquids take place between the molecules of gas i.e it becomes soluble. When we increase the temperature of the mixture, the particles (molecules) of gas gain heat energy and begin to move randomly at fast speed because of which the arrangement of molecules of gas and liquids gets disturbed and so the gases tend to be less soluble in liquids as the temperature is increased.

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Answer 2

Hey !!

                     Gas + Liquid ⇄ Dissolved gas ; ΔH = -ve

Dissolution of gas in liquid is an exothermic process. As the temperature is increased, according to LeChatelier's principle the equilibrium will shift backward. This results in decrease of solubility of gases in liquid.

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