Give the principle and working of sublimation with an example.
- Principle of sublimation - Sublimation is based on the difference between the sublimable and non-sublimable nature of solids.
- Working - A mixture of sublimable and non-sublimable substances is placed on an evaporating dish which is covered with an inverted flask plugged with cotton. On heating, the sublimable component evaporates and further condenses on the sides of the flask and the non-sublimable component remains in the evaporating dish.
- Example: Sublimation can be used for the separation of ammonium chloride and sodium chloride in the laboratory.