Sodium thiosulfate
CAS 7772-98-7Na2O3S2158.11 g/mol
Sodium thiosulfate is an inorganic sodium salt composed of sodium and thiosulfate ions in a 2:1 ratio. It has a role as a nephroprotective agent, an antifungal drug and an antidote to cyanide poisoning. It contains a thiosulfate(2-).
IUPAC: disodium;dioxido-oxo-sulfanylidene-lambda6-sulfane
PubChem
Physical & Chemical Properties
| Melting Point | 48.5 °C |
| Density | 1.667 |
| Solubility | PRACTICALLY INSOL IN ALCOHOL |
| Vapor Pressure | Vapor pressure at 20 °C: negligible |
| Appearance | Liquid; Water or Solvent Wet Solid; Dry Powder; Pellets or Large Crystals; Gas or Vapor |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
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HS Code(s): 2832
Data: UN Comtrade
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