Question

Describe an example for the separation of mixtures by sublimation. 

Describe a method of separating ammonium chloride from the mixture of ammonium chloride and common salt.

Answer 1

Aim : 

To separate ammonium chloride from the mixture of ammonium chloride and common salt. 

Materials required : 

China dish, funnel, cotton, ammonium chloride, common salt and stove.

Procedure: 

1.  Take one table spoon of ammonium chloride and one table spoon of common salt and mix them. 
2.  Take the mixture in a China dish. 
3.  Take a glass funnel. 
4.  Plug the mouth of the funnel with cotton.
5.  Invert the funnel over the dish. 
6.  Heat the dish on the stove and observe the walls of the funnel. 

Observations : 

Initially we find vapours of ammonium chloride and then solidified ammonium chloride on the walls of the funnel.