Sodium superoxide

Sodium superoxide
Sodium superoxide
CAS number 12034-12-7
PubChem 61542
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


Solubility in water Decomposes
Basicity (pKb) N/A
EU classification Corrosive
R-phrases R35
S-phrases S1/2, S26, S37/39, S45
NFPA 704
NFPA 704.svg
Flash point Non flammable
Related compounds
Other anions sodium oxide
sodium peroxide
Other cations potassium superoxide
 YesY superoxide (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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]


  1. ^ Stephen E. Stephanou, Edgar J. Seyb Jr., Jacob Kleinberg "Sodium Superoxide" Inorganic Syntheses 1953; Vol. 4, 82-85.
  2. ^ Sasol Encyclopaedia of Science and Technology , G.C. Gerrans, P. Hartmann-Petersen , p.243 "sodium oxides" , google books link

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