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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.
Figure: Separation of mixture of common salt and ammonium chloride by sublimation
The following steps of separation of common salt and ammonium chloride by sublimation is as follows:
- The mixture of common salt and ammonium chloride is taken in a china dish.
- This mixture is then kept on a burner. The china dish is covered with an inverted glass funnel.
- A loose cotton plug is placed over the open end of the funnel to prevent vapours from escaping.
- The mixture of common salt and ammonium chloride is then heated.
- Vapours of ammonium chloride are formed. These vapours, on rising, get condensed after coming in contact with the cold inner walls of the funnel. A white solid of pure ammonium chloride is obtained.
- Common salt does not change into vapours. So, it remains in the china dish.
Ammonium chloride has a property to sublime, i.e., to get converted directly from solid to vapour state. But, common salt lacks this property.
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