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 pictograms
GHS Signal word	Danger
GHS hazard statements	H314, H318, H413
GHS precautionary statements	P261, P264, P271, P280, P302+352, P304+340, P305+351+338, P312, P321, P332+313, P337+313, P362, P403+233, 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

Kosswig, Kurt (2000). "Sulfonic Acids, Aliphatic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a25_503.

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