Sodium disulfite
An inorganic sodium salt composed of sodium and disulfite ions in a 2:1 ratio. — ChEBI
Safety documents & references
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Identity & molecular properties
Source-linked values| CAS number | 7681-57-4 | ChEBI ↗ |
| Molecular formula | 2Na.O5S2 | ChEBI ↗ |
| Molar mass | 190.109 g/mol | ChEBI ↗ |
| Monoisotopic mass | 189.89825 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:114786 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 190.11 g/mol | PubChem ↗ |
| Exact mass | 189.89825401 Da | PubChem ↗ |
PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.
Names & structural identifiers
Copy any identifiersodium disulfitedisodium oxido(oxo)-kappa(4)-sulfanesulfonateHRZFUMHJMZEROT-UHFFFAOYSA-LO=S([O-])S(=O)(=O)[O-].[Na+].[Na+]InChI=1S/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2Names & synonyms
Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.
Classification & relationships
ChEBI ontologyRoles recorded in ChEBI
Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.
Safety classification · Japan
NITE / Japanese governmentDisodium disulphite · R06-C-104-JNIOSH
Selected source-reported endpoints. Other endpoints, rationales and conditions remain in the original classification. Missing or unlisted information does not mean non-hazardous. This is not a global classification or transport decision.
Read the original NITE classificationMass ↔ amount of substance
Calculated from sourced massUses 190.109 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Research & patent references
Selected source associationsSources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.