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potassium pyrosulfate : ウィキペディア英語版
potassium pyrosulfate

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Potassium pyrosulfate (potassium disulfate) is a chemical compound, K2S2O7. 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. 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.
It is also used as a catalyst in conjunction with vanadium(V) oxide, for example.〔''Sulfur trioxide production'' BurkhardtD.B. US patent no. 3362786 issued Jan 1968,〕
==See also==

* Sodium pyrosulfate

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