Methanedisulfonic acid

Methanedisulfonic acid
Names
	IUPAC name methanedisulfonic acid
	Other names methionic acid
Identifiers
CAS Number	503-40-2;
3D model (JSmol)	Interactive image;
ChemSpider	9998;
ECHA InfoCard	100.007.243
EC Number	207-966-4;
PubChem CID	10427;
UNII	55N1VUX48W;
CompTox Dashboard (EPA)	DTXSID3060118 ;
	InChI InChI=1S/CH4O6S2/c2-8(3,4)1-9(5,6)7/h1H2,(H,2,3,4)(H,5,6,7) Key: OPUAWDUYWRUIIL-UHFFFAOYSA-N;
	SMILES C(S(=O)(=O)O)S(=O)(=O)O;
Properties
Chemical formula	CH4O6S2
Molar mass	176.16 g·mol−1
Appearance	colorless solid
Melting point	96–100 °C (205–212 °F; 369–373 K)
Solubility in water	infinite
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314, H413
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Methanedisulfonic acid is the organosulfur compound with the formula CH₂(SO₃H)₂. It is the disulfonic acid of methane. It is prepared by treatment of methanesulfonic acid with oleum. Its acid strength (pK_a) is comparable to that of sulfuric acid.^[1]

References