Rhodium(I), (II), and (III) salts are known, but the most important are the rhodium(III) salts. [Rhodium(III) chloride] Chemical formula: RhCl 3 . In addition to the anhydrous form, trihydrate and tetrahydrate forms are known, and commercially available rhodium has a composition equivalent to that of the trihydrate. The anhydrous form is a brownish red powder that is insoluble in water and acid and decomposes in an alkaline hydroxide solution. When heated strongly, it is reduced to rhodium, and in the presence of hydrogen, reduction occurs at about 190 °C. The hydrate is a dark red crystal that easily deliquesces and dissolves in water and ethyl alcohol. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ロジウム(I),(II),(III)塩が知られているが,重要なのはロジウム(III)塩である。 [塩化ロジウム(III)] 化学式RhCl3。無水和物のほかに3,4水和物が知られ,市販のものは3水和物に相当する組成をもつ。無水和物は褐赤色粉末で,水や酸に溶けず,水酸化アルカリ溶液中で分解する。強熱するとロジウムに還元され,水素があれば190℃くらいで還元が起こる。水和物は,暗赤色の潮解しやすい結晶で,水やエチルアルコールに溶ける。 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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