Sodium superoxide
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| Sodium superoxide | |
|---|---|
|
sodium(I) superoxide |
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Other names
sodium superoxide |
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| Identifiers | |
| CAS number | 12034-12-7  |
| PubChem | 61542 |
| Properties | |
| Molecular formula | NaO2 |
| Molar mass | 54.9886 g/mol |
| Appearance | Yellow crystalline solid |
| Density | 2.2 g/cm3 |
| Melting point |
551.7 °C |
| Boiling point |
Decomposes |
| Solubility in water | Decomposes |
| Basicity (pKb) | N/A |
| Hazards | |
| EU classification | Corrosive |
| R-phrases | R35 |
| S-phrases | S1/2, S26, S37/39, S45 |
| NFPA 704 |
 0
3
1
OX
|
| Flash point | Non flammable |
| Related compounds | |
| Other anions | sodium oxide sodium peroxide |
| Other cations | potassium superoxide |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Sodium superoxide is the inorganic compound with the formula NaO2. This yellow-orange solid is a salt of the superoxide anion. It is an intermediate in the oxidation of sodium by oxygen.
NaO2 is prepared by treating sodium peroxide with oxygen at high pressures:[1]
- Na2O2 + O2 → 2 NaO2
It can also be prepared by careful oxygenation of a solution of sodium in ammonia:
- Na + O2 → NaO2
The product is paramagnetic, as expected for a salt of the O2− anion. It hydrolyses readily to give a mixture of sodium hydroxide and hydrogen peroxide, oxygen may also be evolved.[2]. It crystallizes in the NaCl motif.[citation needed]
[edit] References
- ^ Stephen E. Stephanou, Edgar J. Seyb Jr., Jacob Kleinberg "Sodium Superoxide" Inorganic Syntheses 1953; Vol. 4, 82-85.
- ^ Sasol Encyclopaedia of Science and Technology , G.C. Gerrans, P. Hartmann-Petersen , p.243 "sodium oxides" , google books link
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