Wednesday, August 14, 2013


                   Alums are double sulphate salts. Alum is in reference to potassium alum. It is a compound of hydrated potassium aluminium sulfate with chemical formula KAl(SO4)2.12H2O. Any of the compound with the empriocal formula AB(SO4)2.12H2O.are considered to be alum. A is a monovalent cation such as potassium or ammonium. B is a trivalent metal ion such as aluminium or chromium. Some times alum is seen in its crystalline form, although it is most often sold as a powder.

Types of alum :

  • Potash alum
  • Soda alum
  • Ammonium alum
  • Aluminum sulfate
  • Selenate alum
  • Chrome alum

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