Why does solubility of most gases in liquid decrease with rise in temperature?

Shrey Grade: 11

        Why does solubility of most gases in liquid decrease with rise in temperature?

6 years ago

Answers : (2)

Aarti Gupta

askIITians Faculty

300 Points

							Solubility of gases in liquid decreases with rise in temperature can be explained as follows:-
 Attractive intermolecular interactions in the gas phase are essentially
 zero for most substances. When a gas dissolves, it does so because its 
molecules interact with solvent molecules. Because heat is released when
 these new attractive interactions form, dissolving most gases in 
liquids is an exothermic process (?Hsoln<0). Conversely, adding 
heat to the solution provides thermal energy that overcomes the 
attractive forces between the gas and the solvent molecules, thereby 
decreasing the solubility of the gas.The phenomenon is similar to that 
involved in the increase in vapor pressure of a pure liquid with 
increasing temperature.
 In the case of vapor pressure, however, it is attractive forces between
 solvent molecules that are being overcome by the added thermal energy 
when the temperature is increased.
Thanks & regard
Aarti Gupta
askiitians Faculty

6 years ago

Approved