| Sodium oxide | |
|---|---|
  |
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| General | |
| Systematic name | Sodium oxide |
| Other names | Disodium oxide, soda |
| Molecular formula | Na2O |
| Molar mass | 61.979 |
| Appearance | White solid |
| CAS number | [1313-59-3] |
| Properties | |
| Density and phase | 2.27 g/cm3 |
| Solubility in water | reacts to form sodium hydroxide |
| Other solvents | Insolubility |
| Melting point | 1132 °C |
| Boiling point | Decomposes at 1950 °C |
| Structure | |
| Coordination geometry |
8-coordinate |
| Crystal structure | cubic |
| Hazards | |
| MSDS | External MSDS |
| EU classification | Corrosive (C) |
| R-phrases | R8, R14, R35 |
| S-phrases | S8, S27, S39, S42, S45 |
| NFPA 704 |
 0
3
1
|
| Flash point | Non-flammable |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Sodium oxide is a chemical compound with the formula Na2O. It is used in ceramics and glasses. Treatment with water affords sodium hydroxide.
- Na2O + H2O → 2 NaOH
The alkali metal oxides M2O (M = Na, K, Rb) crystallise in the antifluorite structure. In this motif the positions of the anions and cations are reversed relative to their positions in CaF2.[1]
Contents |
Applications
In the typical application, glass contains around 15% sodium oxide, the other components being silicon dioxide and calcium oxide at around 70% and 9%, respectively. The soda serves as a flux to lower the temperature at which the silica melts. Soda glass has a lower melting temperature vs pure silica, and has improved mechanical properties due to its slight increases in elasticity. These changes arise because the silicon dioxide and soda react to form sodium silicates of the general formula Na2[SiO2]x[SiO3]. Na2O forms when sodium is treated with oxygen.
- 4 Na + O2 → 2 Na2O
Burning sodium in air will produce Na2O and about 20% sodium peroxide Na2O2.
- 6 Na + 2 O2 → 2 Na2O + Na2O2
Pure Na2O can be prepared by reaction of liquid sodium with NaNO3.
- 10 Na + 2 NaNO3 → 6 Na2O + N2
See also
References
- ^ Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.
