CRYSTALLIZATION - PURIFICATION OF SUBSTANCES BY CRYSTALLIZATION
 
 
 
CRYSTALLIZATION
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   The process by which we prepare crystals of a substance is called crystallization.
   In the process of crystallization following steps are involved.
 
  • Preparation of solution.
  • Filtration.
  • Crystal formation. (Cooling)
  • Drying of crystals
PURIFICATION OF SUBSTANCES
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   Substances can be purified by crystallization.
STEPS OF PURIFICATION
 
 
Preparation of solution
 
   A definite amount of given substance is dissolved in a specific amount of water in a beaker to prepare    aqueous solution of substance. The beaker is heated to dissolve maximum amount of solute. The solution    must be saturated.
Filtration of solution
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   In second step, solution is filtered while hot. The insoluble impurities are separated.
Crystal formation
 
   The filtered solution is cooled to produce crystals of substance.
Drying of crystals
 
   Crystals so obtained are wet. They are dried by solar heat or by placing between the paper folds to    remove moisture.
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