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Pyrosulfate

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Pyrosulfate
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In chemistry, disulfate or pyrosulfate is the anion with the molecular formula S
2
O2−
7
. Disulfate is the IUPAC name. [1] It has a dichromate-like structure and can be visualised as two corner-sharing SO4 tetrahedra, with a bridging oxygen atom.[2] In this anion, sulfur has an oxidation state of +6. Disulfate is the conjugate base of the hydrogen disulfate (hydrogen pyrosulfate) ion HS
2
O
7
, which in turn is the conjugate base of disulfuric acid (pyrosulfuric acid).

Thumb
Chemical structure of the disulfate anion
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Role in sulfation

Industrial production of sulfate ester-based surfactants involves the reaction (sulfation) of fatty alcohols with sulfur trioxide. For example, dodecyl alcohol is sulfated using sulfur trioxide. The reaction proceeds by initial formation of the pyrosulfate:

2 SO3 + ROH → ROSO2−O−SO3H
ROSO2−O−SO3H → ROSO3H + SO3

Several million tons are produced annually.[3]

See also

References

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