Sodium tetrathionate

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Sodium tetrathionate dihydrate
Sodium tetrathionate.png
IUPAC name
Sodium (sulfonatodisulfanyl)sulfonate dihydrate
Jmol 3D model Interactive image
PubChem 203055
Molar mass 306.2665 g/mol (dihydrate)
Appearance white powder
Density 2.1 g/mL (25 ℃)
30.6 g/L (20 ℃)
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Sodium tetrathionate is a salt of sodium and tetrathionate with the molecular formula Na2S4O6. The structure of sodium tetrathionate is somewhat like two sodium thiosulfate (Na2S2O3) molecules joined together at the S+2 ends.

Sodium tetrathionate is formed by the oxidation of sodium thiosulfate (Na2S2O3) with liquid iodine (I2).[1] The sodium tetrathionate Na2S4O6 formed can be isolated from the solution by fractional crystallization.


  1. Comparative Inorganic Chemistry, Bernard Moody