The chemical formula is NaI. There are anhydrous forms, dihydrate NaI・2H 2 O, and pentahydrate NaI・5H 2 O. The anhydrous form is a colorless cubic crystal. It has a sodium chloride structure and a lattice constant of 6.4728 Å. Its specific gravity is 3.667. Its melting point is 651°C, and its boiling point is 1300°C. The interatomic distance of the ion pair Na + -I - in the gas is 2.7115 Å. It is deliquescent, with a solubility of 158.7 g (0°C) and 302 g (100°C) in 100 g of water. It dissolves in methyl alcohol, ethyl alcohol, acetone, and glycerin. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
化学式はNaI。無水和物,2水和物NaI・2H2O,5水和物NaI・5H2Oがある。無水和物は無色立方晶系結晶。塩化ナトリウム型構造,格子定数6.4728Å。比重3.667。融点651℃,沸点1300℃。気体中でのイオン対Na+―I-の原子間距離は2.7115Å。潮解性があり,水100gに対する溶解度158.7g(0℃),302g(100℃)。メチルアルコール,エチルアルコール,アセトン,グリセリンに溶ける。
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