You are provided with a solution of substance $'X'$. How will you test whether it is saturated or unsaturated with respect to $'X'$ at a given temperature? What happens when a hot saturated solution is allowed to cool?

(N/A) To test if a solution is saturated or unsaturated,add more of the solute $'X'$ to the solution at the same temperature while stirring.
$1$. If the added solute $'X'$ dissolves completely,the solution is unsaturated.
$2$. If the added solute $'X'$ remains undissolved and settles at the bottom,the solution is saturated.
When a hot saturated solution is allowed to cool,the solubility of the solute decreases,causing the excess solute to crystallize and separate out from the solution.