At a constant pressure the solubility of a gas in a liquid solvent changes when temperature is increased. State what change occurs and explain
Answers
Liquids and solids exhibit practically no change of solubility with changes in pressure. Gases as might be expected, increase in solubility with an increase in pressure. Henry's Law states that: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.
Explanation:
In the forward process, the gas dissolves in the liquid,
while in the reverse process, the dissolved gas molecules leave
the solution. The former process is exothermic, whereas the
later is endothermic. So, according to Le Chatelier's principle,
raising temperature at equilibrium will favour the reverse
process, which in turn will cause a portion of dissolved gas
molecules to leave the solution. As a result, the equilibrium
will shift to left and the concentration of the dissolved gas in
the solution will get reduced. This is why the solubility of a gas
in a liquid decreases with rise in temperature.