A student is given a mixture of naphthalene ball’s powder and common salt

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#1

A student is given a mixture of naphthalene ball’s powder and common salt. He need to separate this mixture. How will he do this?


#2

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.