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Disulfuric acid
Chemical compound / From Wikipedia, the free encyclopedia
Disulfuric acid (alternative spelling disulphuric acid) or pyrosulfuric acid (alternative spelling pyrosulphuric acid), also named oleum, is a sulfur oxoacid.[3] It is a major constituent of fuming sulfuric acid, oleum, and this is how most chemists encounter it. As confirmed by X-ray crystallography, the molecule consists of a pair of SO2(OH) groups joined by an oxide.[4]
Quick Facts Names, Identifiers ...
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Names | |
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IUPAC name
Disulfuric acid [1] | |
Other names
Pyrosulfuric acid, Oleum | |
Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.029.069 ![]() |
EC Number |
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MeSH | Pyrosulfuric+acid |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
H2O7S2 | |
Molar mass | 178.13 g·mol−1 |
Appearance | colorless |
Melting point | 36 °C (97 °F; 309 K) |
Acidity (pKa) | 2.5 (20 °C; in conc. H2SO4)[2] |
Conjugate base | Disulfate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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