Potash Alum, K2SO4. Al2 (SO4)3.24 H2O:
Potash Alum is prepared from alunite or alum stone.
From Alunite:
Alunite or alum stone is K2SO4. Al2 (SO4)3. 4Al (OH)3. It is finely powdered and boiled with dilute sulphuric acid, the aluminium hydroxide portion modifies into aluminium sulphate. Whenever a little more potassium sulphate in computed quantity is added, the alum is crystallized.Properties:1. Potash alum is a white crystalline solid.2. It is soluble in water however insoluble in alcohol.3. The aqueous solution is acidic due to hydrolysis of Al2 (SO4)3.4. Whenever heated, it melts at 365K and on further heating loses its entire water of crystallization and swells up. The swollen mass thus produced is termed as burnt alum.Uses:
1. It is utilized in purification of water, water proofing of textiles and in dyeing and in paper industry.2. It is also used to arrest bleeding.
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