Question

which method of separation is used to separate ammonium chloride and sodium chloride ​

Answer 1

There are way in separating mixtures of chlorides salts such as that of sodium chloride and ammonium chloride. It can be done by crystallization, filtration or sublimation. The easiest method among the three is separation by sublimation. Ammonium chloride sublimes upon heating. Actually, the sublimation is a decomposition of ammonium chloride forming ammonia and hydrogen chloride. The reaction can be written as:NH_4Cl _((s)) -> NH_3_(g) + HCl_((g))

Sodium chloride on the other hand doesn't sublime and has a higher melting point than ammonium chloride. If we want to separate the mixture, we have to heat up to 330-350 degrees Celsius and collect the gas that will be produced.

Answer 2

Ammonium Chloride is a sublime substance.

So if you put the mixure in a china dish and heat it, the Ammonium chloride gets sublimated, leaving the salt behind.

If you want to collect the Ammonium chloride, you can put the mixure in a inverted funnel and put a cotton ball at the top. after heating, the ammonium chloride gets accumulated in the cotton.