Sources
Help build the largest human-edited directory on the web.
Submit a site - Become an editor
Wikipedia. Licensed under the GNU Free Documentation License.
Are you an expert in this subject? Join the discussion and share your knowledge at Wikipedia.org.
Sodium oxide
From Wikipedia, the free encyclopedia
| Sodium oxide | |
|---|---|
 |
|
| 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 | 2.270 g/cm3 |
| Solubility in water | Decomposes |
| 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, S43, 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 |
|
Sodium oxide is a chemical compound with the formula Na2O. It is used in ceramics and glasses. Like most metal oxides, Na2O can exists only as the pure material - it cannot be dissolved in any solvent without reacting irreversibly. For example, 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 |
Typically, 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 the its slightly increases 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
- ^ Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.
 |
This inorganic compound-related article is a stub. You can help Wikipedia by expanding it. |