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Sodium Metabisulphite

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Sodium Metabisulphite

Chemical Name Sodium metabisulphite
Chemical Formula Na2S2O5
CAS# 7681-57-4
IUPAC ID Sodium Pyrosulphite
EC Number 231-673-0
Appearance White to yellow powder
Flash point Non-flammable
Odour faintly pungent odour similar to that of sulfur dioxide
Uses Sodium sulfite has several applications as an antioxidant, a preservative and as a disinfectant. Some important uses of this compound are listed below.
  • One of the primary ingredients used in Campden tablets.
  • Used to sanitize the equipment used for winemaking & to increase the shelf life of several local anaesthetics.
  • Also used for the removal of tree stumps since it degrades the lignin in it.
  • Being an oxygen scavenger, used as corrosion inhibitor in oil industry.
  • Also used in the treatment of wastewater
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    Sodium metabisulfite is a chemical compound with the formula Na2S2O5. It is also known as sodium pyrosulfite and sodium disulfite. Na2S2O5 is an ionic compound containing the sodium cation (Na+) and the metabisulfite anion (S2O52-). In its standard state, sodium metabisulfite exists as a white or yellowish-white powder, as shown below. When a solution of NaHSO3 (sodium bisulfite) is saturated with SO2 (sulfur dioxide) and then allowed to evaporate, a residue of sodium metabisulfite is obtaine

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