Suggest a method to purify impure sample of potash alum.

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Solution

Potash alum is used in water treatment, it acts as a coagulant to remove impurities.
crystallisation purifies an impure sample of potash alum.
In refined water, the potash alum breaks down the example and filters out the insoluble contaminants.
This mixture is concentrated to the point of crystallisation and then cooled.
crystallisation purifies an impure sample of potash alum.

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