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27/12/2020 3:34 pm
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A student is given a mixture of naphthalene ball powder and common salt. He needs to separate this mixture. How will he do this?
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27/12/2020 3:36 pm
The properties of both naphthalene and common salt should be known, before we choose the separation technique. Naphthalene is a sublimate which on heating changes to gaseous state directly. Hence to separate a volatile compound (sublimate) from a non-volatile compound (non-sublimate), the sublimation process is used.
In a China dish the mixture is kept, and is placed on a stand. An inverted funnel is kept over the mixture in China dish with plugged stem. The sublimate on heating gets collected on the funnel and common salt remains in the China dish.