Sodium thiosulfate
An inorganic sodium salt composed of sodium and thiosulfate ions in a 2:1 ratio. — ChEBI
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Identity & molecular properties
Source-linked values| CAS number | 7772-98-7 | ChEBI ↗ |
| Molecular formula | 2Na.O3S2 | ChEBI ↗ |
| Molar mass | 158.111 g/mol | ChEBI ↗ |
| Monoisotopic mass | 157.90842 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:132112 | ChEBI ↗ |
Names & structural identifiers
Copy any identifiersodium thiosulfatedisodium sulfurothioateAKHNMLFCWUSKQB-UHFFFAOYSA-LO=S(=O)([O-])[S-].[Na+].[Na+]InChI=1S/2Na.H2O3S2/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/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.
Mass ↔ amount of substance
Calculated from sourced massUses 158.111 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
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