Question

What is the effect on boiling point of water when

(a) pressure is increased

(b) impurity is added

Answer 1

(a) The boiling point of water increases with an increase in pressure.

(b) Any impurity present in water lowers its freezing point and raises its boiling point.

For example, salt is added to ice to lower its melting point. Such a mixture is called a freezing-mixture. The melting point of freezing mixture is about $$-15^{0}C$$.