Methanedisulfonic acid

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Methanedisulfonic acid
Methanedisulfonic acid.png
Preferred IUPAC name
Methanedisulfonic acid
Other names
methionic acid
3D model (JSmol)
ECHA InfoCard 100.007.243 Edit this at Wikidata
EC Number
  • 207-966-4
  • InChI=1S/CH4O6S2/c2-8(3,4)1-9(5,6)7/h1H2,(H,2,3,4)(H,5,6,7)
  • C(S(=O)(=O)O)S(=O)(=O)O
Molar mass 176.16 g·mol−1
Appearance colourless solid
Melting point 138–140 °C (280–284 °F; 411–413 K)[1] decomposes: 209-210 °C[2]
Acidity (pKa) -0.71 (predicted)
GHS labelling:
GHS05: Corrosive
H314, H413
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).

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 (pKa) is comparable to that of sulfuric acid.[3]

See also[edit]


  1. ^ Goldwhite, H.; Gibson, M.S.; Harris, C. (January 1965). "Free radical addition reactions—IV". Tetrahedron. 21 (10): 2743–2747. doi:10.1016/S0040-4020(01)98360-7.
  2. ^ Swan, G. A.; Satchell, D. P. N.; Sykes, K. W.; Michelson, A. M.; Boyd, A. N.; Southern, P. F.; Waters, William A.; Cummings, W. A. W.; Harvey, W. E.; Moore, C. G.; Porter, M.; Menzies, I. A.; Owen, L. W.; Mulley, B. A.; de Ruyter van Steveninck, A. W.; Taylor, E. P. (1958). "Notes". Journal of the Chemical Society (Resumed): 2051–2068. doi:10.1039/JR9580002051See note at pages 2058-2060; Cummings, W. A. W. "SOME NEW SULPHUR-CONTAINING DIACIDS."{{cite journal}}: CS1 maint: postscript (link)
  3. ^ Kosswig, Kurt (2000). "Sulfonic Acids, Aliphatic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a25_503.