Ethanedisulfonic acid

Ethane disulfonic acid
Names


IUPAC name Ethane-1,2-disulfonic acid
Other names Edisylate
Identifiers
CAS Number	110-04-3^Y
3D model (Jmol)	Interactive image
ChemSpider	7741^N
ECHA InfoCard	100.003.394
PubChem	8032
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) 111-112 °C (dihydrate)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N (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 to form salts with the active ingredient, it is known as edisylate.