Question

Why the solubility of solute will decrease when the saturated solution will be cooled?

Answer 1

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Increased temperature causes an increase in kinetic energy. The higher kinetic energy causes more motion in the gas molecules which break intermolecular bonds and escape from solution. Check out the graph below: As the temperature increases, the solubility of a gas decreases as shown by the downward trend in the graph.

Answer 2

Answer:

Because the solubility of most solids increases with increasing temperature, a saturated solution that was prepared at a higher temperature usually contains more dissolved solute than it would contain at a lower temperature. When the solution is cooled, it can therefore become supersaturated.