Metatungstate - Metatungsten Sanen

Japanese: メタタングステン酸塩 - メタタングステンサンエン
Metatungstate - Metatungsten Sanen
A salt of metatungstic acid, one of the polytungstic acids formed by condensation of tungstic acid. The general formula is M I 6 [H 2 W 12 O 40 ]・ n H 2 O (it can also be written as M I 2 O・4WO 3n H 2 O). In the past, it was written as M I 10 [H 2 (W 2 O 7 ) 6 ]. M I 3 [W 6 O 21 ], which has the same composition, is sometimes called pseudometungstate. Most are colorless, water-soluble crystals. Aqueous solutions tend to crystallize when cooled, and become syrup-like when concentrated. Ammonium salts and alkali metal salts are easily soluble in water, while lead(II) salts and mercury(II) salts are extremely insoluble.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
タングステン酸が縮合してできるポリタングステン酸の一つのメタタングステン酸の塩。一般式MI6[H2W12O40]・nH2O(MI2O・4WO3nH2Oとも書ける)。古くはMI10[H2(W2O7)6]のように書かれたこともある。同じ組成のMI3[W6O21]を擬メタタングステン酸塩と呼ぶこともある。多く無色の,水に可溶の結晶。水溶液は冷却すると結晶しやすく,濃縮するとシロップ状になる。アンモニウム塩,アルカリ金属塩などは水に易溶,鉛(II)塩,水銀(II)塩などはきわめて難溶である。

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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