Sodium Metabisulfite

IUPAC Name: Sodium Metabisulfite
Formula: Na2S2O5
Origin: China

The inorganic compound of chemical formula Na2S2O5 is sodium metabisulfite or sodium pyrosulfite (IUPAC spelling ; Br. E. sodium metabisulphite or sodium pyrosulphite). Sometimes the material is called disodium metabisulfite. It is used as a preservative, antioxidant and disinfectant.