Describe the method that can be used to separate two compounds with different solubilities in a solvent $S$.

(N/A) The fractional crystallisation method is used to separate two compounds with different solubilities in a solvent.
$1$. Both compounds are dissolved in a solvent to form a hot saturated solution.
$2$. Upon cooling,the compound which is less soluble crystallises first.
$3$. These crystals are separated by filtration.
$4$. The remaining solution (mother liquor) contains the more soluble compound.
$5$. This solution is concentrated by heating and then cooled to induce crystallisation of the more soluble compound,which is then separated by filtration.