Potassium pyrosulfate
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Potassium pyrosulfate
| Potassium pyrosulfate | |
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dipotassium (sulfonatooxy)sulfonate |
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Other names
Potassium pyrosulphate; potassium disulfate |
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| Identifiers | |
| CAS number | 7790-62-7 |
| PubChem | 62681 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | K2O7S2 |
| Molar mass | 254.32 g mol−1 |
| Density | 2.28 g/cm3 |
| Melting point |
325 °C, 598 K, 617 °F |
| Solubility in water | soluble |
| Hazards | |
| R-phrases | R36 R38 |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
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.[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]
See also
References
- ^ Ståhl, K.; Balic-Zunic, T.; da Silva, F.; Eriksen, K. M.; Berg, R. W.; Fehrmann, R. (2005). "The crystal structure determination and refinements of K2S2O7, KNaS2O7 and Na2S2O7 from X-ray powder and single crystal diffraction data". Journal of Solid State Chemistry 178 (5): 1697–1704. doi:10.1016/j.jssc.2005.03.022.
- ^ Trostbl, L. J.; Wynne, D. J. (1940). "Determination of quartz (free silica) in refractory clays". Journal of the American Ceramic Society 23 (1): 18–22. doi:10.1111/j.1151-2916.1940.tb14187.x.
- ^ Sill, C. W. (1980). "Determination of gross alpha, plutonium, neptunium, and/or uranium by gross alpha counting on barium sulphate". Analytical Chemistry 52 (9): 1452–1459. doi:10.1021/ac50059a018.
- ^ Sulfur trioxide production BurkhardtD.B. US patent no. 3362786 issued Jan 1968,
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