How will you separate a mixture of Ammonium chloride and common salt ?

Explanation

Ammonium chloride changes directly from solid to gaseous state on heating. Therefore, to separate such mixtures that contain a sublimable volatile component from a non-sublimable volatile impurity (salt in this case), the sublimation process is used. To do so, take the given mixture in a china dish. Put on inverted funnel on it as shown in Fig.2.4. Start heating the china dish slowly continue heating till no more vapours are formed. Ammonium chloride gets deposited on the inside of the funnel and salt is left behind in the china dish. Some examples of solids which sublime are ammonium chloride, camphor, naphthalene and anthracene.