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CRYSTALLIZATION
- PURIFICATION OF SUBSTANCES BY CRYSTALLIZATION
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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. |
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PURIFICATION
OF SUBSTANCES
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| Substances can be purified by crystallization. | |||
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STEPS
OF PURIFICATION
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Preparation
of solution
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| 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. | |||
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Filtration
of solution
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| In second step, solution is filtered while hot. The insoluble impurities are separated. | |||
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Crystal
formation
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| The filtered solution is cooled to produce crystals of substance. | |||
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Drying
of crystals
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| Crystals so obtained are wet. They are dried by solar heat or by placing between the paper folds to remove moisture. | |||