Question

Suggest a method to purify:
(i) Camphor containing traces of common salt.
(ii) Kerosene oil containing water.
(iii) A liquid which decomposes at its boiling point.

Answer 1

1) camphor can be removed just by heating
2) kerosene oil can be separated by distillation

Answer 2

Answer:

1) Sublimation

2) using a funnel

3) Distillation

1) The mixture should be taken in a china dish.

On heating, camphor sublimates and the common salt is left as a residue in the dish.

Thus camphor and common salt can be separated.

2) This is done using a funnel.

Kersone and water are Immiscible liquids.

They can be seperated using a funnel.

The mixture is passes through a funnel.

Keresone forms upper layer as it is lighter than water.

Thus two separate layers are formed.

This is how kerosene containing water can be separated.

3) vacuum distillation can be used for this process

This process lowers boiling points of most of the liquids.

This process us used to seperate compounds with different boiling points.

Pressure is reduced so boiling point is also reduced.