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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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