You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with a well-labelled diagram.

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Solution

Sublimation:
The phase transition which takes place directly from solid into a vapor is known as sublimation.
Activity:
Properties of naphthalene and ammonium chloride $({NH}_{4} Cl)$ :
Naphthalene is insoluble in water but soluble in an organic solvent. It changes into vapors at room temperature.
Ammonium chloride is soluble in water but insoluble in benzene. It changes into vapors on heating.
Procedure:
Add water to ammonium chloride in order to make a mixture.
Filter the mixture. Naphthalene is obtained as residue while ammonium chloride is collected as filtrate.
Crystallize the filtrate by heating till a saturated solution of ammonium chloride is obtained.
Cool the hot saturated solution to get crystals of ammonium chloride.

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