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Qué (quién) es sulfuric$80141$ - definición
![Acidic [[drain cleaner]]s usually contain sulfuric acid at a high concentration which turns a piece of [[pH paper]] red and chars it instantly, demonstrating both the strong acidic nature and dehydrating property.](https://commons.wikimedia.org/wiki/Special:FilePath/Acidic drain cleaner containing sulfuric acid (sulphuric acid).jpg?width=200 "Acidic [[drain cleaner]]s usually contain sulfuric acid at a high concentration which turns a piece of [[pH paper]] red and chars it instantly, demonstrating both the strong acidic nature and dehydrating property.")
![An acidic [[drain cleaner]] can be used to dissolve grease, hair and even tissue paper inside water pipes.](https://commons.wikimedia.org/wiki/Special:FilePath/Acidic drain opener.JPG?width=200 "An acidic [[drain cleaner]] can be used to dissolve grease, hair and even tissue paper inside water pipes.")
![[[John Dalton]]'s 1808 sulfuric acid molecule shows a central [[sulfur]] atom bonded to three oxygen atoms, or [[sulfur trioxide]], the [[anhydride]] of sulfuric acid.](https://commons.wikimedia.org/wiki/Special:FilePath/Dalton's-sulphuric-acid.jpg?width=200 "[[John Dalton]]'s 1808 sulfuric acid molecule shows a central [[sulfur]] atom bonded to three oxygen atoms, or [[sulfur trioxide]], the [[anhydride]] of sulfuric acid.")
![Rio Tinto]] with its highly acidic water](https://commons.wikimedia.org/wiki/Special:FilePath/Rio tinto river CarolStoker NASA Ames Research Center.jpg?width=200 "Rio Tinto]] with its highly acidic water")
![D]]F in place of HF. (see text)](https://commons.wikimedia.org/wiki/Special:FilePath/Structure of protonated sulfuric acid.png?width=200 "D]]F in place of HF. (see text)")
Wikipedia
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). Oleum is identified by the CAS number 8014-95-7 (EC/List number: 616-954-1 ; ECHA InfoCard: 100.116.872).
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: % acid = 100 + 18/80 × % oleum
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.
