- 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.
- Sodium superoxide was first synthesized in 1949 by the oxidation of sodium peroxide at an oxygen pressure of 289 atmospheres and a temperature of 490°C for a reaction period of 100 hours . Improvements in this process have yielded products which are almost pure.
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