Question

How would you obtain crystals of pure alum from sample of crude alum?​

Answer 1

Answer:

The commercial sample is shaken with water when alum dissolves. The insoluble impurities are removed by filtration. The solution is concentrated and then cooled. On cooling pure crystals of alum separate.

Explanation:

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Answer 2

Answer: HOPE IT HELPS YOU, PLEASE MARK BRAINLIST AND THANK IF IT REALLY HELPS YOU.

Explanation: The commercial sample is shaken with water when alum dissolves. The insoluble impurities are removed by filtration. The solution is concentrated and then cooled. On cooling pure crystals of alum separate.

Simply mix 1/2 very hot tap water with 2-1/2 tablespoons of alum. You can get alum from the spice section of the grocery store or with canning and pickling supplies. The crystal growth becomes visible after a few minutes. You'll get thumbnail-size crystals in a matter of hours.