Fuming sulfuric acid: Difference between revisions
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'''Fuming sulfuric acid''', also called '''oleum''', is produced by adding [[sulfur trioxide]], SO<sub>3</sub>, to [[sulfuric acid]]. It mostly contains disulfuric acid (also called pyrosulfuric acid). | '''Fuming sulfuric acid''', or '''fuming sulphuric acid''', also called '''oleum''', is produced by adding [[sulfur trioxide]], SO<sub>3</sub>, to [[sulfuric acid]]. It mostly contains disulfuric acid (also called pyrosulfuric acid). | ||
:SO<sub>3</sub> + H<sub>2</sub>SO<sub>4</sub> → H<sub>2</sub>S<sub>2</sub>O<sub>7</sub> | :SO<sub>3</sub> + H<sub>2</sub>SO<sub>4</sub> → H<sub>2</sub>S<sub>2</sub>O<sub>7</sub> | ||
Additional sulfur trioxide molecules can be added to create trisulfuric acid (H<sub>2</sub>S<sub>3</sub>O<sub>10</sub>), tetrasulfuric acid (H<sub>2</sub>S<sub>4</sub>O<sub>13</sub>) and so on up to very long [[sulfur trioxide polymer]]s, H(SO<sub>3</sub>)<sub>n</sub>H. | {{Image|Pyrosulfuric acid synthesis.jpg|center|600px|Pyrosulfuric acid is produced from sulfur trioxide and sulfuric acid.}} | ||
This reaction proceeds due to the relative instability of the three (S=O) double bonds present in sulfur trioxide, relative to the presence of two double bonds and two single bonds in the acidic forms. | |||
Additional sulfur trioxide molecules can be added to create [[trisulfuric acid]] (H<sub>2</sub>S<sub>3</sub>O<sub>10</sub>), [[tetrasulfuric acid]] (H<sub>2</sub>S<sub>4</sub>O<sub>13</sub>) and so on up to very long [[sulfur trioxide polymer]]s, H(SO<sub>3</sub>)<sub>n</sub>H. | |||
Latest revision as of 08:05, 8 June 2009
Fuming sulfuric acid, or fuming sulphuric acid, also called oleum, is produced by adding sulfur trioxide, SO3, to sulfuric acid. It mostly contains disulfuric acid (also called pyrosulfuric acid).
- SO3 + H2SO4 → H2S2O7
This reaction proceeds due to the relative instability of the three (S=O) double bonds present in sulfur trioxide, relative to the presence of two double bonds and two single bonds in the acidic forms.
Additional sulfur trioxide molecules can be added to create trisulfuric acid (H2S3O10), tetrasulfuric acid (H2S4O13) and so on up to very long sulfur trioxide polymers, H(SO3)nH.