Q1 of 252 Page 105

Name the solvent you would use to separate a mixture of sulphur and carbon.

A mixture of sulphur and carbon can be separated by the solvent extraction method. Carbon disulphide or carbon tetrachloride is used as a solvent. The sulphur component gets dissolved in solvent and undissolved carbon is separated by filtration. The dissolved sulphur can be evaporated from the solution.


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69

100 ml of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker. The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.

(a) What name is given to solutions like X?


(b) What name is given to solution like Y?


(c) What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice? Why?


(d) What term is used to denote the amount of solid dissolved in 100 grams of water in a solution like Y?

 70

The solubility of ammonium chloride in water at various temperatures is given below:

Temperature: 10°C 20°C 40°C 60°C 80°C


Solubility: 24 g 37 g 41 g 55 g 66 g

 2

Name the process you would use to separate ammonium chloride from a mixture of sodium chloride and ammonium chloride.

 3

Which method can be used to separate a mixture of naphthalene and common salt?