Answer
If it dissolves, the solution was unsaturated. If it will not dissolve, the solution is saturated. If additional crystals form, the solution was supersaturated.
Work Step by Step
Add an additional crystal of KNO3 to the solution.
If it dissolves, the solution was unsaturated. If it will not dissolve, the solution is saturated. If additional crystals form, the solution was supersaturated.