To convert a saturated solution to an unsaturated solution, two common methods are heating the saturated solution or adding more solvent to it. By increasing the temperature of the saturated solution, the solubility of most solids in the solution typically increases. This is because higher temperatures provide more energy to the solvent molecules. By adding more solvent to the existing solution, this dilutes the concentration of the solute in the solution, effectively decreasing its saturation level. As a result, the solution becomes unsaturated.