Write a method to separate a mixture of sand and potash alum.

A mixture of sand and potash alum can be separated by filtration followed by evaporation.

  • Mix sand and potash alum thoroughly with water so that potash alum gets dissolved in water.
  • Sand, being insoluble in water, will not get dissolved in it.
  • On filtering the liquid,  the solid that is left behind will be the sand, and the liquid will be a solution of potash alum.
  • Potash alum is re-crystallized by heating the solution gently. In the process, all the water gets evaporated leaving behind potash alum.

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