Chemical formula: Na 3 PO 4 . Also known as trisodium phosphate or trisodium phosphate (soda). Anhydrous, 1,6,7,10,12 hydrates are known. The anhydrous form is a colorless cubic crystal. Melting point: 1340°C. Specific gravity: 2.537 (17.5°C). Solubility in 100g of water: 4.5g (0°C), 77g (100°C). The aqueous solution is strongly alkaline. The 12-hydrate Na 3 PO 4 ・12H 2 O is a colorless trigonal crystal. Specific gravity: 1.62. When heated, it becomes monohydrate at 100°C. Solubility in 100g of water: 28.3g (15°C). Source: Heibonsha World Encyclopedia, 2nd Edition Information |
化学式Na3PO4。リン酸三ナトリウム,第三リン酸ナトリウム(ソーダ)ともいう。無水和物,1,6,7,10,12水和物が知られている。無水和物は無色立方晶系結晶。融点1340℃。比重2.537(17.5℃)。水100gに対する溶解度4.5g(0℃),77g(100℃)。水溶液は強アルカリ性。12水和物Na3PO4・12H2Oは無色三方晶系結晶。比重1.62。熱すると100℃で1水和物となる。水100gに対する溶解度28.3g(15℃)。
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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