Question

How can you change a saturated solution of an unsaturated solution without adding why more solvent to it

Answer 1

If the solubility of the solute in the solvent is directly proportional to the temperature, then increasing the temperature of the system will make a saturated solution unsaturated. There may be other ways too, but I think the easiest way would be to just add more solvent. The simplest way is to add more solvent

Answer 2

By heating the saturated solution, it becomes unsaturated.