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Chemical database: Potassium metabisulphite

chemistry tutorials - potassium metabisulphite

Chemical formula K2S2O5
Molar mass 222.32 g mol -1
Density 2.34 g cm -3
Melting point decomposition (~ 150 °C)
Boiling point -
Solubility 45.0 g in 100 mL H2O (20 °C)
CAS number 16731-55-8
Hazards chemistry tutorials - potassium metabisulphite - additional data: (R:31-36/37/38)(S:26-36)

Potassium metabisulphite is an inorganic compound which comes in form of small white crystals at standard conditions. Potassium metabisulphite is used as an antioxidant and as a chemical sterilant. The mentioned properties are useful in the production of wine and beer. Sulphur dioxide, which K2S2O5 releases, inhibits the growth of microorganisms. This compound is also used in photographic processing.

Since potassium metabisulphite is used in the sterilization of wine barrels, it can be bought in stores which sell equipment for winemaking. It can also often be found in stores which sell agricultural equipment, but sometimes in common grocery stores as well. Potassium metabisulphite of higher purity can be ordered from specialized chemical selling companies, usually only in larger amounts.


  Acetic acid
  Acetylsalicylic acid
  Ammonium nitrate
  Calcium carbide
  Calcium carbonate
  Calcium hydroxide
  Calcium oxide
  Hydrochloric acid
  Hydrogen peroxide
  Iron(III) oxide
  Lithium carbonate
  Methyl ethyl ketone
  Nitric acid
  Potassium carbonate
  Potassium chlorate
  Potassium chloride
  Potassium metabisulphite
  Potassium nitrate
  Potassium permanganate
  Sodium acetate
  Sodium benzoate
  Sodium bicarbonate
  Sodium bromide
  Sodium carbonate
  Sodium chloride
  Sodium hydroxide
  Sodium hypochlorite
  Sulphuric acid
  Trichloroisocyanuric acid