Name a suitable technique of separation of the components from a mixture of calcium sulphate and camphor.
A mixture of CaSO4 and camphor can be separated by the following two methods :
(i) Camphor is sublimable but CaSO4 is not, therefore, sublimation of the mixture gives camphor on the sides of funnel while CaSO4 in the china dish.
(ii) Camphor is soluble in organic solvents like CHCl3, CCl4 etc. while CaSO4 not. Therefore, when the mixture is shaken with the solvent, camphor goes into solution while CaSO4 remains as residue. It is filtered and evaporation of solvent gives camphor.