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Sodium Sulphite
- Origin
- : China
- CAS Number
- : 7757-83-7
- HS Code
- : 2830.10.00
Basic Info
- IUPAC Name
- : disodium sulfite
- Molecular Formula
- : Na2SO3
- Molecular Weight (g/mol)
- : 126.0400
- Synonyms & Trade Names
- : Sodium sulphite; Sodium sulfite anhydrous; E221
- Purity / Assay (%)
- : 97% min
- Physical Form
- : Solid
- Concentration
- : Pure substance
- Appearance / Color
- : White to off-white solid
- Odor
- : Sulfur-like, slight
- Density (g/cm³)
- : 2.6330
- Solubility in Water
- : Freely soluble (28.3g/100mL)
- Signal Word
- : Warning
- GHS Hazard Class
- : Eye irritant; Skin sensitizer
- H-Statements
- : H315|H317|H319
- P-Statements
- : P261|P264|P272|P280|P305+P351+P338
- REACH Status
- : Registered
- Drug Precursor Status
- : Non-precursor
- Storage Class (GHS)
- : 10
- Storage Conditions
- : Cool, dry; sealed; away from acids
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Brief Overview
Sodium sulphite is widely used as a food preservative to prevent fresh produce and meat from discolouring. It is used in flue-gas desulfurization process. It is widely used in paper and pulp industry as an agent to avoid corrosion problems. A solution of sodium sulphite is of pH 9 and when the solution is exposed to air they are oxidised to sodium sulphate.
Manufacturing Process
Sulphur dioxide and sodium hydroxide when reacted together under laboratory conditions, produce sodium sulphite.
2NaOH + SO2 → Na2SO3 + H2O
In industrial level, sodium sulphite is produced by making sodium carbonate react with sulphur dioxide.
SO2 + Na2CO3 → Na2SO3 + CO2