Q. describe an experiment for separating of pure ammonium chloride from a mixture of common salt and ammonium chloride .
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Answer:
A mixture of ammonium chloride and common salt can be separated using sublimation. The mixture is taken in a china dish and placed on a tripod stand. ... These vapours rise up and get converted into solid ammonium chloride on coming in contact with the cold, inner walls of the funnel.
Put the mixture of ammonium chloride and salt in a chinadish. Keep the dish over a burner and start heating. Also, keep a transparent funnel over it. After sometime, you will observe some vapours inside the funnel. These vapours are of ammonium chloride. This is due to sublimation process in which a solid directly changes into gaseous state without undergoing through liquid state. Thus, common salt and ammonium chloride are now separated. This also proves that ammonium chloride is a volatile substance too.