Exams › JEE Advanced › Chemistry
During the preparation of potash alum, after decanting the mother liquor, the crystals of potash alum are washed by gentle shaking with which of the following?
- 1: 1 mixture of H2SO4 (dilute) + water
- 1: 1 mixture of hot water + alcohol
- 1: 1 mixture of cold water + alcohol
- 1: 5 mixture of dil. H2SO4 + alcohol
Correct answer: 1: 1 mixture of cold water + alcohol
Solution
Crystals of potash alum are washed with a 1:1 cold water and alcohol mixture to clean impurities without dissolving the crystals, since alcohol suppresses the solubility of alum in water.
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