Pyrosulfate

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title: "Pyrosulfate" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["pyrosulfates", "sulfur-oxyanions"] topic_path: "general/pyrosulfates" source: "https://en.wikipedia.org/wiki/Pyrosulfate" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::figure[src="https://upload.wikimedia.org/wikipedia/commons/2/2e/Disulfat-Ion.svg" caption="Chemical structure of the disulfate anion"] ::

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

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: : : Several million tons are produced annually.

References

References

  1. {{RedBookRef
  2. (October 2005). "The crystal structure determinations and refinements of K2S2O7, KNaS2O7 and Na2S2O7 from X-ray powder and single crystal diffraction data". Journal of Solid State Chemistry.
  3. (2019). "Ullmann's Encyclopedia of Industrial Chemistry".

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pyrosulfatessulfur-oxyanions