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Sodium metabisulfite (Na2S2O5)-Crystalline

Sodium metabisulfite (Na2S2O5)-Crystalline

CAS: 7681-57-4
Molecular Formula: Na2S2O5
Purity: 97%
Products Code: TR11160800CP
Specification Model: -100 Mesh
EINECS No.: 231-673-0
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Sodium metabisulfite (Na2S2O5)-Crystalline introduce:



Sodium metabisulfite or sodium pyrosulfite (IUPAC spelling; Br. E. sodium metabisulphite or sodium pyrosulphite) is an inorganic compound of chemical formula Na2S2O5. The substance is sometimes referred to as disodium metabisulfite.

Chemical formula:Na2S2O5, Na-O-(S=O)-O-(S=O)-O-Na

Molar mass: 190.107 g/mol

Appearance: White to yellow powder

Odor: Faint SO2

Density: 1.48 g/cm3

Melting point: 170 °C (338 °F; 443 K) decomposition begins at 150 °C

Solubility in water:45.1 g/100 mL (0 °C);65.3 g/100 mL (20 °C);81.7 g 100 mL (100 °C)

Solubility: Very soluble in glycerol;Slightly soluble in ethanol




Sodium metabisulfite is used as an active ingredient in campden tablets, as a cleaning agent for potable water reverse osmosis membranes, as a preservative and an antioxidant in food. It also acts as a corrosion inhibitor in oil and gas industry, as a bleaching agent in the production of coconut cream, as the source of sulfur dioxide and in the destruction of cyanide in commercial gold cyanidation processes. It is utilized in the precipitation of gold from auric acid as well as in the waste water treatment to remove hexavaent chromium as trivalent chromium by precipitation after reduction. Further, it is used in photography. In addition, it plays as an oxygen scavenger to eliminate the dissolved oxygen in wastewater and in pipes.
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