An increase in the temperature increases the rate of dissolving a solute in a given solution. When a solute is added to a solution, the molecules of solute and solution bump into each other and this causes the dissolving of solute. At low temperatures, the solvent molecules have low energy and hence less chances of collision are there. When we raise the temperature of the solvent, its molecules have more kinetic energy and move at a much faster rate. This causes more collision between solvent and solute molecules and hence faster dissolution of solute.
An example is the mixing of sugar in water, when making tea. We can observe that a sugar cube takes a while to dissolve in a cup of water that came straight out of tap. In comparison, if we were to boil the water, the sugar cube will dissolve much faster.
Hence, temperature increases the rate of dissolving of a solute.
Hope this helps.
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