question_answer

  You are provided with a mixture containing iron filings, ammonium chloride, sand and sodium chloride. Describe the procedure that you would use to separate the constituents from the mixture.

Answer:

                  Place the mixture on a paper or petridish, move a bar magnet many times over the mixture. Iron filings get attached to the magnet and get separated later on by scrapping. Then remaining mixture is transferred to china dish and subjected to sublimation. Ammonium chloride is separated by this step. Now a mixture of sodium chloride and sand is left, that is dissolved in water. Salt dissolves and sand is separated by filtration. Now sodium chloride is separated from water by crystallisation.                                               (3) We can summarise all the processes involved here. (i) Magnetic separation                 (ii) Sublimation (iii) Filtration after dissolution (iv) Crystallisation                                            (2)