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7757-83-7

Name Sodium sulfite
CAS 7757-83-7
EINECS(EC#) 231-821-4
Molecular Formula Na2O3S
MDL Number MFCD00003503
Molecular Weight 126.04
MOL File 7757-83-7.mol

Chemical Properties

Appearance Sodium sulfite is a white crystalline solid
Melting point  500 °C
density  2.63
refractive index  1,484
storage temp.  Store at RT.
solubility  H2O: 1 M at 20 °C, clear, colorless
form  Solid
color  White to slightly yellow
Specific Gravity 2.633
Odor Odorless
PH 9.0-10.5 (25℃, 1M in H2O)
PH Range 9.0 - 10.5 at 126 g/l at 25 °C
Stability: Stable. Incompatible with strong acids. Moisture and air sensitive.
Water Solubility  23 g/100 mL (20 ºC)
Sensitive  Hygroscopic
Merck  14,8682
Contact allergens
Sodium sulfite is mainly used in photographic developers, for fixing prints, bleaching textile fibers, as a reducer in manufacturing dyes, as a remover of Cl in bleached textiles and paper, and as a preservative in the food industry for meat, egg yolks, and so on.
Uses
These white crystals were prepared by passing sulfurous gas over moist sodium carbonate. Sodium sulfite is soluble in water but less so in alcohol. It was used as a preservative for alkaline developers and as a hypo clearing agent in photographic printing.
CAS DataBase Reference 7757-83-7(CAS DataBase Reference)
NIST Chemistry Reference sodium sulfite(7757-83-7)
EPA Substance Registry System Sodium sulfite (7757-83-7)

Safety Data

Hazard Codes  Xn
Risk Statements 
R31:Contact with acids liberates toxic gas.
R36/37/38:Irritating to eyes, respiratory system and skin .
R22:Harmful if swallowed.
R40:Limited evidence of a carcinogenic effect.
R36/38:Irritating to eyes and skin .
Safety Statements 
S24/25:Avoid contact with skin and eyes .
S36:Wear suitable protective clothing .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S22:Do not breathe dust .
WGK Germany  1
RTECS  WE2150000
3-10
TSCA  Yes
HS Code  28321000
Safety Profile
Poison by intravenous and subcutaneous routes. Moderately toxic by ingestion and intraperitoneal routes. Human mutation data reported. When heated to decomposition it emits very toxic fumes of Na2O and SOx. A reducing agent. See also SULFITES.
Hazardous Substances Data 7757-83-7(Hazardous Substances Data)
Toxicity
LD50 i.v. in mice: 175 mg/kg, Hoppe, Goble, J. Pharmacol. Exp. Ther. 101, 101 (1951)

Hazard Information

Material Safety Data Sheet(MSDS)

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