Thiosulfurous acid

Thiosulfurous acid
Names
	IUPAC names sulfurothious S-acid; sulfurothious O,S-acid
	Systematic IUPAC name hydroxidooxidosulfanidosulfur
	Other names sulfurothionous acid ; Thiothionyl hydroxide (minor tautomer)
Identifiers
CAS Number	15060-43-2;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:35926;
ChemSpider	7827575;
Gmelin Reference	184467
PubChem CID	9548652;
CompTox Dashboard (EPA)	DTXSID401045691 ;
	InChI InChI=1S/H2O2S2/c1-4(2)3/h(H2,1,2,3) Key: QAMMXRHDATVZSO-UHFFFAOYSA-N;
	SMILES OS(S)=O;
Properties
Chemical formula	H2S2O2
Molar mass	98.14668
Conjugate base	Thiosulfite
Related compounds
Related compounds	thiosulfuric acid; SSO; thiosulfinic acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Thiosulfurous acid is a hypothetical chemical compound with the formula HS−S(=O)−OH or HO−S(=S)−OH. Attempted synthesis leads to polymers. It is a low oxidation state (+1) sulfur acid. It is the Arrhenius acid for disulfur monoxide. Salts derived from thiosulfurous acid, which are also unknown, are named "thiosulfites", "thionosulfites" or "sulfurothioites". The ion is S=SO²⁻
₂.