Ethanedisulfonic acid

Ethane disulfonic acid

Names
Preferred IUPAC name Ethane-1,2-disulfonic acid
Other names Edisylic acid
Identifiers
CAS Number	110-04-3 Y
3D model (JSmol)	Interactive image
ChemSpider	7741 N
ECHA InfoCard	100.003.394
PubChem CID	8032
UNII	DL69Y31QQV Y
CompTox Dashboard (EPA)	DTXSID00149089
InChI InChI=1S/C2H6O6S2/c3-9(4,5)1-2-10(6,7)8/h1-2H2,(H,3,4,5)(H,6,7,8) N Key: AFAXGSQYZLGZPG-UHFFFAOYSA-N N InChI=1/C2H6O6S2/c3-9(4,5)1-2-10(6,7)8/h1-2H2,(H,3,4,5)(H,6,7,8) Key: AFAXGSQYZLGZPG-UHFFFAOYAT
SMILES OS(=O)(=O)CCS(=O)(=O)O
Properties
Chemical formula	C2H6O6S2
Molar mass	190.18 g·mol−1
Melting point	172 to 174 °C (342 to 345 °F; 445 to 447 K)[1] 111-112 °C (dihydrate)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Ethanedisulfonic acid is a diprotic sulfonic acid, with pKa values of -1.46 and -2.06, making it a very strong acid. When used in pharmaceutical formulations, the salts with the active ingredient are known as edisylates.