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
Astringent: Used in skin care products, mouthwashes, and aftershaves.
Water Purification: Acts as a coagulant to remove suspended particles.
Food Industry: Serves as a firming agent.
Dyeing and Textile Printing: Used as a mordant.
Traditional Medicine: Treats minor cuts and abrasions.
Storage
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.