Chemical formula: NaH. Gray crystalline powder. Cubic rock-salt structure. A typical salt-type hydride, it forms an ionic lattice consisting of Na + and H - (hydride ions). Specific gravity: 0.93. Refractive index: 1.470. Heat of formation: 12.8 kcal/mol. At high temperatures, it decomposes into sodium and hydrogen. The dissociation pressure of hydrogen is 1 atmosphere at 425°C. It is stable in dry air. It decomposes in moist air and reacts violently with water to produce hydrogen and sodium hydroxide. It is insoluble in benzene, carbon disulfide, carbon tetrachloride, and liquid ammonia. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
化学式NaH。灰色の結晶性粉末。立方晶系岩塩型構造。典型的な食塩型水素化物で,Na+とH-(水素化物イオン)から成るイオン格子を形成している。比重0.93。屈折率1.470。生成熱12.8kcal/mol。高温でナトリウムと水素とに分解する。水素の解離圧は425℃で1気圧。乾燥空気中では安定。湿った空気によって分解し,水と激しく反応して水素を発生し,水酸化ナトリウムを生ずる。ベンゼン,二硫化炭素,四塩化炭素,液体アンモニアに不溶。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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