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Potassium pyrosulfate

Potassium pyrosulfate (potassium disulfate) is a chemical compound, K₂S₂O₇ with CAS number of 7790-62-7. It contains the pyrosulfate anion S₂O₇²⁻ which has a dichromate like structure and can be visualised as two corner sharing SO₄ tetrahedra, with a bridging oxygen atom.^[1] A semi-structural formula for pyrosulfate ion is O₃SOSO₃²⁻. In this compound sulfur has an oxidation state of +6.
Potassium pyrosulfate is used in analytical chemistry; samples are fused with potassium pyrosulfate,(or a mixture of potassium pyrosulfate and potassium fluoride, KF) to ensure complete dissolution prior to a quantitative analysis.^[2]^[3] It is also used as a catalyst in conjunction with vanadium(V) oxide, for example.^[4]

References

^ The crystal structure determination and refinements of K₂S₂O₇, KNaS₂O₇ and Na₂S₂O₇ from X-ray powder and single crystal diffraction data Ståhl K , Balic-Zunic T, da Silva F, Eriksen K M , Berg R W Fehrmann R Journal of Solid State Chemistry 178, 1697-1704, (2005) doi:10.1016/j.jssc.2005.03.022
^ Determination of quartz (free silica) in refractory clays Trostbl L.J., Wynne D.J. Journal of the American Ceramic Society 23 1 18, (1940) doi:10.1111/j.1151-2916.1940.tb14187.x
^ Determination of gross alpha, plutonium, neptunium, and/or uranium by gross alpha counting on barium sulphate C. W. Sill Analytical Chemistry, (1980) 52, 1452
^ Sulfur trioxide production BurkhardtD.B. US patent no.3362786 issued Jan 1968,

Categories: Sulfates | Potassium compounds

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Potassium_pyrosulfate". A list of authors is available in Wikipedia.

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Potassium pyrosulfate

References

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