Page 7 - REMOVING IMPURITIES FROM WATER AND PURIFYING IT (2)

2. DISTILLATION

• It is a separation process in which

a liquid is first heated and then
cooled to obtain it in pure form.

•On heating, the liquid changes into
the vapour state. These vapours

then pass through a condenser. Cold

water circulates in the condenser.

This cools the vapours and gives
back the liquid in its pure form.

•When a mixture of water and a
soluble impurity, for example salt, is

heated, the water starts boiling and

evaporates to form water vapour.

When the water vapour passes
through the condenser, it cools

back to give water. The water thus

collected is pure water, salt, on the
other hand, is left behind.