Arsenite(3-)
An arsenite ion resulting from the removal of all three protons from the hydroxy groups of arsenous acid. — ChEBI
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Identity & molecular properties
Source-linked values| CAS number | 15502-74-6 | ChEBI ↗ |
| Molecular formula | AsO3 | ChEBI ↗ |
| Molar mass | 122.919 g/mol | ChEBI ↗ |
| Monoisotopic mass | 122.90799 Da | ChEBI ↗ |
| Formal charge | -3 | ChEBI ↗ |
| ChEBI identifier | CHEBI:29866 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 122.920 g/mol | PubChem ↗ |
| Exact mass | 122.906338 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 identifierarsenite(3-)arseniteOWTFKEBRIAXSMO-UHFFFAOYSA-N[O-][As]([O-])[O-]InChI=1S/AsO3/c2-1(3)4/q-3Names & 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 122.919 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsAsOCalculated 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.