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How does recrystallization work? and What physical change is associated with this technique?

How does recrystallization work? and What physical change is associated with this technique?

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Recrystallization is a method of purifying a solid in a solvent. It is based on the principle of solubility according to which solubility increases with temperature. As the temperature increases, the amount of solute dissolved increases in the solvent.

The impure compound is dissolved and the temperature is increased. As the temperature is decreased, the Solubility of both impurities and the compound decrease. The compound then crystallizes leaving the impurities in the solution. This then is filtered to obtain pure crystals. This is a very slow procedure and requires hit and trial procedure for choosing the solvent.

The physical change involved is dissolution of solid compound and reappearing of crystals by forming solids from solution. The physical changes are solid to solution and back to solids from a solution.

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