Neptunium(VII) oxide-hydroxide
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| Names | |
|---|---|
| Other names
Neptunyl hydroxide | |
| Identifiers | |
3D model (JSmol) |
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CompTox Dashboard (EPA) |
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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).
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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
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]
