Orthotungstic acid H 2 WO 4 is formed in an aqueous solution of tungsten(VI) oxide WO 3 , which condenses to form metatungstic acid H 6 [H 2 W 12 O 40 ] and paratungstic acid H 10 [H 10 W 12 O 46 ] (polytungstic acid), a compound with the general formula x M I 2 O・ y WO 3 ・ z H 2 O. When y / x = 1, it is ortho, when 12/5, it is para, and when 4, it is metatungstate. Usually, it refers to the simplest orthotungstate. Orthotungstate M I 2 WO 4 , the alkali metal salts K 2 WO 4 , Na 2 WO 4 and the ammonium salt (NH 4 ) 2 WO 4 are colorless crystals that dissolve in water and are alkaline. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
酸化タングステン(VI) WO3の水溶液に生ずるオルトタングステン酸H2WO4,これが縮合して生ずるメタタングステン酸H6[H2W12O40]やパラタングステン酸H10[H10W12O46]など(ポリタングステン酸)の塩で,一般式xMI2O・yWO3・zH2Oで表される化合物。y/x=1のときがオルト,12/5がパラ,4がメタタングステン酸塩である。普通は最も簡単なオルトタングステン酸塩をさす。 オルトタングステン酸塩MI2WO4 アルカリ金属塩K2WO4,Na2WO4およびアンモニウム塩(NH4)2WO4は,無色の結晶で,水に溶けてアルカリ性を示す。
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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