Question

How will you separate a mixture of common salt, sulphur powder and sand?

Answer 1

The mixture contains sulphur, common salt (sodium chloride) and sand. They can be separated as follows:

1. Add water to the mixture. Salt will dissolve in water. Filter the solution.
2. Filterate is the solution of Salt and residue contains sulphur and sand.
3. Evaporate the filtrate, water will vapourize leaving behind salt.
4. To the residue containing sulphur and sand add carbon disulphide, this will dissolve sulphur.
5. Filter this solution.
6. The filtrate will contain sulphur dissolved in carbon disulphide and residue will be sand.
7. Evaporate the filtrate, to obtain crystals of Sulphur.