Name: Metalloids
Uploaded: 2019-07-19
Duration: 2 min 48 s
Description: You know about metals and non-metals. Certain elements, like silicon and germanium, used in semiconductors have characteristics intermediate between metals a...

Question

With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.

Accepted Answer

Ammonium chloride can be separated from a mixture of ammonium chloride and common salt by the process of sublimation. This is done as follows:

The mixture of common salt and ammonium chloride is taken in a china dish and placed on a tripod stand. The china dish is covered with an inverted glass funnel. A loose cotton plug is placed in the upper, open end of the funnel to prevent ammonium chloride vapours from escaping into the atmosphere. The china dish is heated by using a burner. On heating the mixture, ammonium chloride changes into white vapours. These vapours rise up and get converted into solid ammonium chloride on coming in contact with the cold, inner walls of the funnel. In this way, pure ammonium chloride gets collected on the inner sides of the funnel in the form of sublimate and can be removed. Common salt does not change into vapours on heating, so it remains in the china dish. Thus, the mixture has been separated into its two components: ammonium chloride and common salt.

This separation of ammonium chloride and common salt has been made possible by the difference in the properties of ammonium chloride and common salt. Ammonium chloride has a property to sublime. However, common salt lacks this property.

With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.

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