Names | |
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Preferred IUPAC name
Methanedisulfonic acid | |
Other names
methionic acid
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Identifiers | |
CAS Number
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3D model (JSmol)
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ChemSpider |
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ECHA InfoCard | 100.007.243 |
EC Number |
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PubChem CID
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UNII |
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CompTox Dashboard (EPA)
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InChI
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SMILES
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Properties | |
Chemical formula
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CH4O6S2 |
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] |
Solubility in water
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miscible |
Acidity (pKa) | -0.71 (predicted) |
Hazards | |
GHS labelling: | |
Pictograms
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Signal word
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Danger |
Hazard statements
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H314, H413 |
Precautionary statements
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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
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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]