Sulfite
A sulfur oxoanion that is the conjugate base of hydrogen sulfite (H2SO3). — ChEBI
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Identity & molecular properties
Source-linked values| CAS number | 14265-45-3 | ChEBI ↗ |
| Molecular formula | O3S | ChEBI ↗ |
| Molar mass | 80.064 g/mol | ChEBI ↗ |
| Monoisotopic mass | 79.95791 Da | ChEBI ↗ |
| Formal charge | -2 | ChEBI ↗ |
| ChEBI identifier | CHEBI:17359 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 80.07 g/mol | PubChem ↗ |
| Exact mass | 79.95681503 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 identifiersulfitesulfiteLSNNMFCWUKXFEE-UHFFFAOYSA-LO=S([O-])[O-]InChI=1S/H2O3S/c1-4(2)3/h(H2,1,2,3)/p-2Names & synonyms
Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.
Classification & relationships
ChEBI ontologyMass ↔ amount of substance
Calculated from sourced massUses 80.064 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsOSCalculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.
Research & patent references
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Sources & 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.