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 is called a freezing mixture is about -15° C.