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|Section2= |Section3= |Section4= |Section7= |Section8= }} Sodium oxide (SOX) is a chemical compound with the formula Na2O. It is used in ceramics and glasses, though not in a raw form. It is the base anhydride of sodium hydroxide, so when water is added to sodium oxide NaOH is produced. :Na2O + H2O → 2 NaOH The alkali metal oxides M2O (M = Li, 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, with sodium ions tetrahedrally coordinated to 4 oxide ions and oxide cubically coordinated to 8 sodium ions.〔Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.〕 ==Preparation== Sodium oxide is produced by the reaction of sodium with sodium hydroxide, sodium peroxide, or sodium nitrite: : 2 NaOH + 2 Na → 2 Na2O + H2 : Na2O2 + 2 Na → 2 Na2O : 2 NaNO2 + 6 Na → 4 Na2O + N2 Most of these reactions rely on the reduction of something by sodium, whether it is hydroxide, peroxide, or nitrite. Burning sodium in air will produce Na2O and about 20% sodium peroxide Na2O2. :6 Na + 2 O2 → 2 Na2O + Na2O2 Alternatively, sodium carbonate can be heated to 851 °C, producing carbon dioxide and sodium oxide. : Na2CO3 → Na2O + CO2 At 208 °C, sodium ascorbate will decompose to furan derivatives and sodium oxide.〔http://pubchem.ncbi.nlm.nih.gov/compound/23667548〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sodium oxide」の詳細全文を読む スポンサード リンク
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