Sodium peroxide
Sodium peroxide is an inorganic compound with the formula Na2O2. This yellowish solid is the product of sodium ignited in excess oxygen. It is a strong base. This metal peroxide exists in several hydrates and peroxyhydrates including Na2O2·2H2O2·4H2O, Na2O2·2H2O, Na2O2·2H2O2, and Na2O2·8H2O. The octahydrate, which is simple to prepare, is white, in contrast to the anhydrous material.
| Names | |
|---|---|
| IUPAC name
Sodium peroxide | |
| Other names
Flocool Solozone Disodium peroxide | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.013.828 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UNII | |
| UN number | 1504 |
CompTox Dashboard (EPA) |
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| Properties | |
| Na2O2 | |
| Molar mass | 77.98 g/mol |
| Appearance | yellow to white powder |
| Density | 2.805 g/cm3 |
| Melting point | 460 °C (860 °F; 733 K) (decomposes) |
| Boiling point | 657 °C (1,215 °F; 930 K) (decomposes) |
| Reacts | |
| Solubility | Soluble in acid Insoluble in base Reacts with ethanol |
| −28.10·10−6 cm3/mol | |
| Structure | |
| hexagonal | |
| Thermochemistry | |
Heat capacity (C) |
89.37 J/(mol·K) |
Std molar entropy (S⦵298) |
95 J/(mol·K) |
Std enthalpy of formation (ΔfH⦵298) |
−515 kJ·mol−1 |
Gibbs free energy (ΔfG⦵) |
−446.9 kJ/mol |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
caustic |
| GHS labelling: | |
| Danger | |
| H271, H314 | |
| P210, P220, P221, P260, P264, P280, P283, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P306+P360, P310, P321, P363, P370+P378, P371+P380+P375, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Safety data sheet (SDS) | External MSDS |
| Related compounds | |
Other cations |
Lithium peroxide Potassium peroxide Rubidium peroxide Caesium peroxide |
| Sodium oxide Sodium superoxide Sodium ozonide | |
Related compounds |
Sodium hydroxide Hydrogen peroxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
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