Describe the separation of pure alum from impure one with dosgram
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The impure compound is dissolved in a suitable solvent in which it is sparingly soluble at room temperature but appreciably soluble at higher temperature. The solution is concentrated to get nearly a saturated solution. ... When this saturated solution is cooled , crystals of pure alum will be separated out.
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Pure solids are removed as crystal from the solution through crystallisation. Crystallisation is used to purify solids, e.g., seperation of crystals of alum from impure samples.
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