A sodium salt of silicic acid. Various compositions are known. The most common is sodium metasilicate, Na 2 SiO 3. The anhydrate is obtained by eutectic distillation of powdered quartz with sodium carbonate at 1000 °C, and the hydrate is obtained by reacting freshly precipitated silicon dioxide with a calculated amount of sodium hydroxide. The anhydrate is a colorless orthorhombic crystal. Melting point 1088 °C. It dissolves readily in water, and its aqueous solution is hydrolyzed to a strong alkalinity. Various hydrates of Na 2 SiO 3 are obtained from the aqueous solution. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ケイ酸のナトリウム塩。種々の組成のものが知られている。最もふつうにはメタケイ酸ナトリウムNa2SiO3をさす。石英粉末を炭酸ナトリウムと1000℃で共融すると無水和物が得られ,新しく沈殿させた二酸化ケイ素を計算量の水酸化ナトリウムと反応させると水和物が得られる。無水和物は無色斜方晶系の結晶。融点1088℃。水に容易に溶け,水溶液は加水分解して強いアルカリ性を示す。水溶液からはNa2SiO3の各種の水和物が得られる。
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