Corrosive liquid of excess sulfur trioxide in solution.
For the community in California, see Oleum, California.
Oleum
Identifiers
CAS Number
8014-95-7Y
ECHA InfoCard
100.116.872
EC Number
616-954-1
CompTox Dashboard (EPA)
DTXSID5064889
Properties
Chemical formula
H2S2O7
Appearance
colorless fuming liquid
Related compounds
Related compounds
sulfuric acid sulfur trioxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound
Oleum (Latin oleum, meaning oil), or fuming sulfuric acid, is a term referring to solutions of various compositions of sulfur trioxide in sulfuric acid, or sometimes more specifically to disulfuric acid (also known as pyrosulfuric acid).[1]
Oleums can be described by the formula ySO3·H2O where y is the total molar mass of sulfur trioxide content. The value of y can be varied, to include different oleums. They can also be described by the formula H2SO4·xSO3 where x is now defined as the molar free sulfur trioxide content. Oleum is generally assessed according to the free SO3 content by mass. It can also be expressed as a percentage of sulfuric acid strength; for oleum concentrations, that would be over 100%. For example, 10% oleum can also be expressed as H2SO4·0.13611SO3, 1.13611SO3·H2O or 102.25% sulfuric acid. The conversion between % acid and % oleum is:
For x = 1 and y = 2 the empirical formula H2S2O7 for disulfuric (pyrosulfuric) acid is obtained. Pure disulfuric acid is a solid at room temperature, melting at 36 °C and rarely used either in the laboratory or industrial processes — although recent research indicates that pure disulfuric acid has never been isolated yet.[2]
^Hinds, John Iredelle Dillard (January 1902). Inorganic Chemistry: With the Elements of Physical and Theoretical Chemistry. J. Wiley & sons.
^Kim, Seong Kyu; Lee, Han Myoung; Kim, Kwang S. (28 October 2015). "Disulfuric acid dissociated by two water molecules: ab initio and density functional theory calculations". Physical Chemistry Chemical Physics. 17 (43): 28556–28564. Bibcode:2015PCCP...1728556K. doi:10.1039/C5CP05201G. PMID 26400266.
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acid), 70 grams of oleic acid, and 17 grams of linoleic acid (oil table). Oleum amygdalae, the fixed oil, is prepared from either sweet or bitter almonds...
chamber process, the contact process also produces sulfur trioxide and oleum. In 1901 Eugen de Haën patented the basic process involving combining sulfur...
pyrosulphuric acid), also named oleum, is a sulfur oxoacid. It is a major constituent of fuming sulfuric acid, oleum, and this is how most chemists encounter...
attested in English 1176, the word oil comes from Old French oile, from Latin oleum, which in turn comes from the Greek ἔλαιον (elaion), "olive oil, oil" and...
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'olive fruit; olive tree'. The word oil originally meant 'olive oil', from ŏlĕum, ἔλαιον (élaion 'olive oil'). The word for 'oil' in multiple other languages...
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oil'), which comes from Latin petra 'rock' (from Greek pétra πέτρα) and oleum 'oil' (from Greek élaion ἔλαιον). The origin of the term stems from monasteries...
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