Molecular properties
- Formula
- H2O3S
- Molar mass
- 82.08 g·mol−1
- Exact mass
- 81.9725 Da
- 0
- PubChem CID
- 1100
Molecule record
sulfurous acid
H2O3S
82.08 g/mol
Loading structure
Functional groups
No functional-group assignment has been curated yet.
Physical properties
No source-backed physical properties are curated for this molecule yet.
Common names and synonyms
- 231-973-1
- 7782-99-2
- CHEBI:48854
- DTXCID5022435
- DTXSID7042435
- EINECS 231-973-1
- H2SO3
- J1P7893F4J
Show all 24 synonyms
- MFCD00011335
- RefChem:6277
- S(O)(OH)2
- SULFUROUS ACID (H2SO3)
- SULFUROUS ACID (II)
- SULPHUROSUM ACIDUM
- Schweflige saure
- Schweflige saure [German]
- Sulphurous acid
- UN1833
- UNII-J1P7893F4J
- acide sulfureux
- acido sulfuroso
- dihydroxidooxidosulfur
- schweflige Saeure
- trioxosulfuric acid
Structure identifiers
- Canonical SMILES
- O=S(O)O
- Isomeric SMILES
- OS(=O)O
- InChI
- InChI=1S/H2O3S/c1-4(2)3/h(H2,1,2,3)
- InChIKey
- LSNNMFCWUKXFEE-UHFFFAOYSA-N
- PubChem CID
- 1100
Spectroscopy
Tabs appear only for spectra stored with clear provenance.
No redistributable or simulated spectroscopy record is attached yet.
Simulated NMR
On-demand educational prediction for sulfurous acid; not experimental data.
Simulated EI mass spectrum
On-demand educational fragmentation for sulfurous acid; not experimental data.
Sources
Molecule identity
Retrieved 8/20/2026. Reuse status is summarized by the badge; open the source for full details.