CAS No. 7631-90-5

Sodium bisulfite (sodium hydrogen sulfite) is a chemical compound with the chemical formula NaHSO3. Sodium bisulfite is a food additive with E number E222. This salt of bisulfite can be prepared by bubbling sulfur dioxide in a solution of sodium carbonate in water. Sodium bisulfite in contact with chlorine bleach (aqueous solution of sodium hypochlorite) will generate heat and form sodium bisulfate and sodium chloride.
Appearance & Physical State	white powder
Density	1.48
Melting Point	150ºC
Refractive Index	1.43 - 1.47
Water Solubility	300 g/L
Stability	Stable. Incompatible with strong oxidizing agents, strong acids.
Storage Condition	Store at RT.

Purity (NaHSO3)	99.0%min
SO2	64-67%
Water insoluble	0.03% max
Chloride (Cl)	0.05% max
Iron (Fe)	0.004% max
Heavy metal (as Pb)	0.001% max
Arsenic (As)	0.0002% max
PH Value	4.0-5.0

Molecular Formula: HNaO3S
Molecular Weight: 104.06
Hazard Symbols: Xn
UN Number: UN 2693
WGKGermany: 1
HS Code: 28321000

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Purity: 58.%
Spec 1: White crystal powder
Application: Used for bleaching cotton fabrics and organic compounds, reducing agents, pharmaceutical intermediates, bleaching agents, preservatives, antioxidants.

Appearance	White or light yellow powder
NaHSO3,%	≥ 99.00
Water insoluble,%	≤ 0.03
Fe,%	≤ 0.003
As,%	≤ 0.0002
Pb,%	≤ 0.001