Sodium tetrathionate

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Sodium tetrathionate dihydrate
	IUPAC name Sodium (sulfonatodisulfanyl)sulfonate dihydrate
Identifiers
CAS number	13721-29-4
PubChem	203055
	InChI InChI=1S/2Na.H2O6S4.2H2O/c;;1-9(2,3)7-8-10(4,5)6;;/h;;(H,1,2,3)(H,4,5,6);21H2/q2+1;;;/p-2 Key: HAEPBEMBOAIUPN-UHFFFAOYSA-L
Properties
Molecular formula	Na₂S₄O₆
Molar mass	306.2665 g/mol (dihydrate)
Appearance	white powder
Density	2.1 g/mL (25℃)
Solubility in water	30.6 g/L (20℃)
Hazards
NFPA 704	0 2 0
Except where noted otherwise, 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).^{[citation needed]} The sodium tetrathionate Na₂S₄O₆ formed can be isolated from the solution by fractional crystallization.

References

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