Sodium metabisulphite IP 5KG Go Back

CASR

: 7681-57-4

Molecular Formula

: Na2S2O5

Molecular Weight

: 190.1
Specifications  
Description: Colourless, prismatic crystals or a white or creamy white powder; odour, sulphurous.
Solubility: Freely soluble in water; slightly soluble in ethanol (95%)
Identification A: The solution is colourless and gives reaction (A) of sodium salts.
Identification B: The solution is colourless and gives reaction (A) of sulphates.
pH: 3.5 to 5.0
Arsenic (As): 4ppm max
Heavy metals: 20ppm max
Iron (Fe): 40ppm max
Thiosulphate(S2O3): Not more than a faint opalescence is produced
Assay: 95.0% - 100.5%
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