SUPERSATURATION

By cooling an undersaturated solution

How to create supersaturated solution?

A simple example is making rock candy. Sugar is added to a volume of water that has been heated to some elevated temperature. The amount of sugar added is less than the saturation value at that temperature. Once all the sugar has been dissolved, the solution is removed from the heat and allowed to cool. As it cools, the total amount of sugar that the solution can hold decreases. If cooled far enough, the concentration of the solution will pass over the solubility line and the solution will be supersaturated. The degree of supersaturation depends on the initial concentration and the extent of cooling.

First method