Neptunium(VII) oxide-hydroxide

Neptunium(VII) oxide-hydroxide  Names

Other names

Neptunyl hydroxide

Identifiers

3D model (JSmol)

* Interactive image

InChI

* InChI=1S/Np.3H2O.2O/h;3*1H2;;/q+3;;;;;/p-3

Key: QJJOKRDJFDRNCY-UHFFFAOYSA-K

SMILES

* [Np+3](=O)=O.[OH-].[OH-].[OH-]

Properties

Chemical formula

| NpO2(OH)3
Molar mass | 320.02 g/mol
Appearance  | Black solid

Solubility in water

| 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 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]

## 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

1. ↑ 1.0 1.1 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" (in English). 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.
2. ↑ Robert J. Lemire (2001). Lemire, Robert. ed (in English). Chemical Thermodynamics of Neptunium and Plutonium. Elsevier Science. p. 116. ISBN 9780444503794.

* v
* t
* e

Neptunium compounds

Np(III)|

* NpF3
* NpCl3
* NpBr3
* NpI3

Np(IV)|

* NpF4
* NpCl4
* NpBr4
* NpO2
* Np(C8H8)2

Np(V)|

* NpF5

Np(VI)|

* NpF6

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Neptunium(VII) oxide-hydroxide. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Chemistry:Neptunium(VII)_oxide-hydroxide&oldid=1077919"
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template