# Trithionic acid

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Trithionic acid Names IUPAC names Thiodisulfuric acid 1,5-Dihydrido-2,2,4,4-tetraoxido-1,5-dioxy-2,3,4-trisulfy-[5]catena[1] Trithionic acid Identifiers CAS Number 27621-39-2 3D model (JSmol) Interactive image ChEBI CHEBI:29210 ChEMBL ChEMBL3754893 ChemSpider KRURGYOKPVLRHQ-UHFFFAOYSA-N PubChem CID 492 CompTox Dashboard (EPA) DTXSID90182006 InChI InChI=1S/H2O6S3/c1-8(2,3)7-9(4,5)6/h(H,1,2,3)(H,4,5,6) Key: KRURGYOKPVLRHQ-UHFFFAOYSA-N SMILES OS(=O)(=O)SS(=O)(=O)O Properties Chemical formula H2O6S3[1][2][3] Molar mass 194.19 g·mol−1[3] Density 2.4±0.1 g/cm3 Melting point 324.41 °C (615.94 °F; 597.56 K) Boiling point 739.35 °C (1,362.83 °F; 1,012.50 K) Solubility in water 1.0·106 mg/L log P −1.1[2] Vapor pressure 1.07·10−16 Pa (8.05·10−19 mm Hg) Acidity (pKa) −6.94[2] Conjugate base Hydrogen trithionate Refractive index (nD) 1.700 Pharmacology Pharmacokinetics: Biological half-life 0.570 hours Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chemical compound

**Trithionic acid** is a [polythionic acid](/source/Polythionic_acid) with three sulfur atoms. It can be viewed as two [bisulfite](/source/Bisulfite) radicals bridged by a sulfur atom.

## References

1. ^ [***a***](#cite_ref-EBI_1-0) [***b***](#cite_ref-EBI_1-1) EBI Web Team. ["trithionic acid (CHEBI:29210)"](https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:29210). *ChEBI*. Retrieved 23 September 2018.

1. ^ [***a***](#cite_ref-EBI2_2-0) [***b***](#cite_ref-EBI2_2-1) [***c***](#cite_ref-EBI2_2-2) ["Compound Report Card"](https://www.ebi.ac.uk/chembl/compound/inspect/CHEMBL3754893). *EBI*. Retrieved 23 September 2018.

1. ^ [***a***](#cite_ref-PubChem_3-0) [***b***](#cite_ref-PubChem_3-1) ["Trithionic acid"](https://pubchem.ncbi.nlm.nih.gov/compound/Trithionic_acid). *PubChem*. Retrieved 23 September 2018.

v t e Sulfur compounds Sulfides and disulfides Al2S3 As2S2 As2S3 As2S5 As4S4 Au2S Au2S3 B2S3 BaS BeS Bi2S3 CS2 C3S2 C6S6 CaS CdS CeS CoS Cr2S3 CSSe CSTe CuFeS2 CuS D2S Dy2S3 Er2S3 EuS FeS2 GaS H2S HfS2 HgS In2S3 K2S LaS Li2S MgS MoS2 MoS3 NaHS Na2S NH4HS NiS P4Sx PbS PbS2 PSCl3 PSI3 PtS ReS2 Re2S7 SiS SrS TlS VS SeS2 S2U WS2 WS3 Sb2S3 Sb2S5 Sb4S3O3 Sm2S3 Y2S3 ZrS2 La 2O 2S Gd 2O 2S Sulfur halides S2Br2 SBr2 S2Cl2 SCl2 SCl4 S2F2 SF2 SF4 S2F10 SF6 S2I2 Sulfur oxides and oxyhalides BrSO3F S2O5Cl2 F2S5O2 FClO5S2 F2OS3 ISO3F F2O6S2 SO2 SO3 SOBr2 SOCl2 SOF2 SOF4 SO2F2 SO2BrF SO2ClF SO2Cl2 H2S3O6 I3SO3F S3O8Cl2 S3O8F2 H2SO3 H2SO4 H2S2O7 H2SO5 Sulfites (NH4)2SO3 Li2SO3 Na2SO3 K2SO3 MgSO3 CaSO3 BaSO3 CdSO3 Ag2SO3 Sulfates Ag2SO4 CaSO4 CuSO4 Cs2SO4 Er2(SO4)3 Eu2(SO4)3 HgSO4 K2SO4 KAl(SO4)2 NaAl(SO4)2 RaSO4 SnSO4 SrSO4 Ti(SO4)2 Tm2(SO4)3 Yb2(SO4)3 Zr(SO4)2 Sulfur nitrides SN S2N2 S4N4 Thiocyanates HSCN KSCN Co(SCN)2 Polythionates [NaS3O6]− [NaS4O6]− [NaS5O6]− [NaS6O6]− [NaS7O6]− Organic compounds Thiol CH3SH CCl3SH CH3CH2SH Cysteine Coenzyme B Coenzyme M Glutathione Organic sulfide CH3SCH3 Methionine Heterocycles C2H4S C4H4S Thiamine Biotin Thia-crown ether Sulfonium S-Adenosyl methionine S-Methylmethionine Dimethylsulfoniopropionate Disulfide C32H66S2 Heterocycles Lipoic acid Trisulfide CH3SSSCH3 Thiosulfinate Allicin Sulfinic acid Hypotaurine Sulfone CFNO3S C2N2O4S Sulfonate Coenzyme M Taurine 3'-Phosphoadenosine-5'-phosphosulfate Organic thiocyanates C2H3SN

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Adapted from the Wikipedia article [Trithionic acid](https://en.wikipedia.org/wiki/Trithionic_acid) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Trithionic_acid?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.