Question

You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride. Write in four steps the procedure you would use to separate these constituents.

Answer 1

1)Ammonium chloride is sublimable at 335C. Heat the mixture, Ammonium chloride will sublime to give pungent fumes of ammonia and hydrogen chloride gas. Collect them and heat them to form NH4Cl again.

2) Bring a magnet near the mixture, The iron fillings will be attracted to the magnet.

3) Pour water, NaCl will dissolve and sand will not dissolve. Then evaporate the water to get the NaCl back.

4) Sand will settle down, collect it.

Answer 2

the procedure us as follows-
1) take the mixture of ammonium chloride, sand and common salt in a china dish and set up the sublimation apparatus.
2) heat this mixture, ammonium chloride will be separated on the walls of the inverted funnel. the residue left behind in the china dish. contains sand and common salt.
3) dissolve the mixture in water, common salt will dissolve but sand will not. filter the sand from the mixture using filter paper.
4) sand is separated as residue and filterate is salt solution in water. heat the solution to evaporate water and to get the dry sample of common salt.