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explain why alum crystals are washed free off impurities with ethanol ice water mixture rather than...

explain why alum crystals are washed free off impurities with ethanol ice water mixture rather than with room temperature deionized water.

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Answer #1

Alum = KAl(SO4)2·12H2O

Alum crystals are chemically hydrated aluminum potassium sulphate.

Alum crystals are usually made by slowly dehydrating an aqueous solution of aluminum potassium sulfate.

If alum crystals are washed free off contaminants with deionized water , alum crystals start dissolve in water again.

But alum crystals are insoluble in ethanol ice water mixture.

That’s why, alum crystals are washed free off impurities with ethanol ice water mixture rather than with room temperature deionized water.

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