Potassium tetraperoxochromate
Wikipedia on Answers.com:
Top
Potassium tetraperoxochromate (V)
| Potassium tetraperoxochromate(V) | |
|---|---|
 |
|
| Identifiers | |
| CAS number | 12331-76-9 |
| Properties | |
| Molecular formula | K3CrO8 |
| Molar mass | 297.286 |
| Appearance | red brown |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
|
| Infobox references | |
Potassium peroxochromate, or potassium tetraperoxochromate(V), is an inorganic chemical having the chemical formula K3[Cr(O2)4]. A crystalline ionic solid with a brown color, it is the potassium salt of tetraperoxochromate(V), one of the few examples of chromium in the +5 oxidation state.[1]
Preparation
Potassium peroxochromate is prepared by reacting hydrogen peroxide with potassium chromate at low temperatures:
- 2 CrO2−
4 + 8 H2O2 → 2 [Cr(O2)4]2− + 8 H2O
The intermediate tetraperoxochromate(VI) is reduced by hydrogen peroxide, forming tetraperoxochromate(V):[2][3]
- 2 [Cr(O2)4]2− + 2 OH− + H2O2 → 2 [Cr(O2)4]3− + 2 H2O + O2
Thus, the overall reaction is:
- 2 CrO2−
4 + 9 H2O2 + 2 OH− → 2 [Cr(O2)4]3− + 10 H2O + O2
The compound decomposes spontaneously at higher temperatures.
References
- ^ Sergienko, V. S. (2007). "Structural chemistry of peroxo compounds of group VI transition metals: I. Peroxo complexes of chromium". Crystallography Reports 52 (4): 639–646. doi:10.1134/S1063774507040116.
- ^ Haxhillazi, Gentiana. "Preparation, Structure and Vibrational Spectroscopy of Tetraperoxo Complexes of CrV+, VV+, NbV+ and TaV+". http://deposit.ddb.de/cgi-bin/dokserv?idn=969592612&dok_var=d1&dok_ext=pdf&fi....
- ^ Riesenfeld, E. H.; Wohlers, H.E.; Kutsch, W.A. (1905). "Höhere Oxydationsproducte des Chroms". Chemische Berichte der Deutschen Chemischen Gesellschaft 38: 1885–1898. doi:10.1002/cber.190503802113.
 |
This inorganic compound-related article is a stub. You can help Wikipedia by expanding it. |
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
Post a question - any question - to the WikiAnswers community:
Copyrights:
Wikipedia on Answers.com
This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article Potassium tetraperoxochromate(V).
Read more