Home › Chemicals › Sodium Sulfite CAS 7757-83-7: Sodium Sulfite (Na2SO3) Identity CAS Number 7757-83-7 Molecular Formula Na2SO3 IUPAC Name disodium sulfite Molecular Weight 126.04 g/mol SMILES [O-]S(=O)[O-].[Na+].[Na+]Synonyms sodium sulfite, disodium sulfite, sulfurous acid disodium salt, sodium sulfite anhydrous
2D Structure
Physical Properties Density 2.63 g/mL at 25°C Boiling Point 1700.0°C Melting Point 500.0°C Flash Point None°C Vapor Pressure 0.0 kPa at 20°C Refractive Index nD = 1.565 Dielectric Constant ε = 5.0
Safety & GHS Classification Irritant
H302: Harmful if swallowed H319: Causes serious eye irritation Storage: Store in a cool, dry area. Oxidizes slowly in air to sodium sulfate. Keep container tightly sealed. Store away from strong acids and strong oxidizers.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Excellent PE Excellent PP Excellent PEEK Excellent PVDF Excellent
Rubbers Material Rating Viton Excellent NBR Excellent EPDM Excellent Silicone Excellent FKM Excellent
Metals Material Rating Stainless 316 Excellent Aluminum Excellent Copper Good Brass Good
Applications Food preservative (E221 — antioxidant) Photographic developer preservative Water treatment dechlorination agent Textile bleaching agent Paper and pulp manufacturing Rubber antiscorching agent Laboratory reducing agent Beverage manufacturing antioxidant External References: PubChem
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