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Potash Alum (Potassium Aluminium Sulfate)

Preparation

  • Potash alum is typically prepared by the reaction of aluminium sulphate with potassium sulphate:

Al2(SO4)3 + K2SO4 → 2KAl(SO4)2

Properties

  • A colorless, odorless, crystalline compound.

  • Soluble in water.

  • Commonly found as a dodecahydrate (KAl(SO₄)₂·12H₂O), forming translucent, colorless crystals.

Uses

  1. Astringent: Used in skin care products, mouthwashes, and aftershaves.

  2. Water Purification: Acts as a coagulant to remove suspended particles.

  3. Food Industry: Serves as a firming agent.

  4. Dyeing and Textile Printing: Used as a mordant.

  5. Traditional Medicine: Treats minor cuts and abrasions.

Storage of Potash Alum

  • Store in a cool, dry place, away from heat, moisture, and incompatible materials.

  • Keep in a tightly closed container to prevent contact with air and moisture.


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