Question

Explain effects of impurities on boiling and freezing point

Answer 1

​​​​​​Dear Student,

Adding impurities to a solution, in most cases, increases the boiling point of the solution. This occurs because the presence of impurities decreases the number of water molecules available to become vaporized during boiling.

When an impurity is added its freezing point is lowered i.e. its freezing point decreases. The depression in freezing point increases with the increase in concentration of the solute because on adding the solute the vapour pressure of solution becomes lower than that of pure solvent.

Regards,