Cadmium permanganate is an inorganic compound with the chemical formula Cd(MnO4)2. It can form the hexahydrate Cd(MnO4)2·6H2O.
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3D model (JSmol)
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| Cd(MnO4)2 | |
| Molar mass | 350.28 |
| Appearance | dark purple crystals[1] |
| soluble | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
editCadmium permanganate can be obtained by reacting cadmium sulfate and barium permanganate. After removing the barium sulfate precipitate, the solution is crystallized in the dark:[1]
- Ba(MnO4)2 + CdSO4 → Cd(MnO4)2 + BaSO4↓
Cadmium permanganate can also be produced by reacting manganese heptoxide with cadmium oxide[2] or cadmium hydroxide.[3]
Properties
editCadmium permanganate hexahydrate loses water of crystallisation at 61~62 °C, and anhydrate can be obtained at a constant temperature of 90 °C. The anhydrous form begins to decompose at 108 °C:[3]
- Cd(MnO4)2 → CdMnO3 + MnO2 + 3/2 O2↑
References
edit- ^ a b Kótai, László; Banerji, Kalyan K. (2001-03-31). "An Improved Method for the Preparation of High-Purity Permanganate Salts". Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry. 31 (3): 491–495. doi:10.1081/SIM-100002234. ISSN 0094-5714. Archived from the original on 2021-02-20. Retrieved 2020-06-21.
- ^ Kótai, László; Sajó, István E.; Gács, István; Sharma, Pradeep K.; Banerji, Kalyan K. (Jul 2007). "Convenient Routes for the Preparation of Barium Permanganate and other Permanganate Salts". Zeitschrift für anorganische und allgemeine Chemie (in German). 633 (8): 1257–1260. doi:10.1002/zaac.200700142. Retrieved 2020-06-21.
- ^ a b Zhang, Zhongsheng; Wu, Jigui; Zhang, Yanni (1991-07-02). "Research on Kinetic Parameters of Cadmium Permanganate by Thermogravimetry". Journal of Lanzhou University (Natural Science) (in Chinese). 27 (2). doi:10.13885/j.issn.0455-2059.1991.02.019.