Here's why:
* Saturated solution: A saturated solution is a solution that holds the maximum amount of solute that can dissolve at a given temperature and pressure. Any additional solute added will simply settle at the bottom.
* Crystallization: Crystallization is the process by which a dissolved solute comes out of solution and forms solid crystals.
The key is that the solution remains saturated even after crystallization.
When a saturated solution cools down, it can no longer hold as much dissolved solute. The excess solute comes out of solution and forms crystals. However, the solution itself remains saturated, just with some of the solute now in the solid form.
Example:
Imagine a glass of sugar water that is at its maximum capacity for dissolved sugar. This is a saturated solution. If you cool this solution down, some of the sugar will crystallize out of the solution. But, the remaining solution will still be saturated.
Therefore, a saturated solution that has crystallized is still a saturated solution, just with some of the solute now in a solid crystalline form.
