Neptunium(VII) oxide-hydroxide
Neptunium(VII) oxide-hydroxide is a chemical compound which has neptunium in its highest oxidation state of +7. This compound reacts with basic salts such as potassium hydroxide to form neptunates (NpO53-) and water.[1]
- NpO2(OH)3 + 3KOH → K3NpO5 + 3H2O
| Names | |
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| Other names
Neptunyl hydroxide | |
| Identifiers | |
3D model (JSmol) |
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| Properties | |
| NpO2(OH)3 | |
| Molar mass | 320.02 g/mol |
| Appearance | Black solid |
| 10 mg/l | |
| Solubility | Soluble in nitric acid and 1 M potassium hydroxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Neptunium(VII) oxide-hydroxide is stable in an alkaline solution, however, it is slowly reduced to Np(VI) in an acidic solution. In water, it forms a greenish solution.[1] This compound decomposes slowly to an oxidized solid.[2]
Production
Neptunium(VII) oxide-hydroxide is produced by the oxidation of Np(VI) in alkaline solution with ozone, then neutralized with nitric acid to precipitate out the neptunium(VII) oxide-hydroxide.
References
- V.I.Spitsyn; A.D.Gelman; N.N.Krot; M.P.Mefodiyeva; F.A.Zakharova; Yu.A.Komkov; V.P.ShilovI.; V.Smirnova (1968). "Heptavalent state of neptunium and plutonium". Journal of Inorganic and Nuclear Chemistry. Institute of Physical Chemistry of the Academy of Sciences of the USSR. 31 (9): 2733–2745. doi:10.1016/0022-1902(69)80187-9.
- Robert J. Lemire (2001). Lemire, Robert (ed.). Chemical Thermodynamics of Neptunium and Plutonium. Elsevier Science. p. 116. ISBN 9780444503794.
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