Sodium metabisulfite USP-NF/Ph.Eur 5KG Go Back

CASR

: 7681-57-4

Molecular Formula

: Na2S2O5

Molecular Weight

: 190.1
Specifications  
Appearance: White or almost white to yellowish crystalline powder or colorless crystals..
Solubility: Freely soluble in water. Slightly soluble in ethanol (96%).
Identification A (By pH): 3.5 to 5.0
Identification (Reaction of sulfates): White precipitate should form.
Identification (Reaction of sodium): A dense white precipitate should form.
Identification (Sulfite): A filter paper moistened with mercurous nitrate solution should blacken.
Appearance of solution: Clear and colorless solution.
pH: 3.5 to 5.0
Thiosulfates: The solution should remain clear for at least 15 min.
Limit of Thiosulfate: 0.05% max.
Arsenic (As): 5ppm max.
Iron (Fe): 20ppm max (0.002%).
Limit of Chloride: 0.05% max.
Assay (as SO2): 65.0%- 67.4%.
Assay: 95.0% - 100.5%.
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