Ionic Equilibria in Mixed Solvents. XI. A Critical Survey of Hydroxo Complexes of Beryllium in Aqueous and Aqueous Mixed Solvents
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概要
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Hydrolytic reactions of beryllium ion were studied in water-methanol, water-ethanol, and water-acetone mixtures, 0.2 mole fraction of an organic component being contained. In all the solutions containing 3M LiClO<SUB>4</SUB> as an ionic medium at 25 °C, we found the Be<SUB>2</SUB>OH<SUP>3+</SUP>, Be<SUB>2</SUB>(OH)<SUB>2</SUB><SUP>2+</SUP>, Be<SUB>3</SUB>(OH)<SUB>3</SUB><SUP>3+</SUP>, and Be(OH)<SUB>2</SUB> complexes. However, in a supplementary work in a 3M LiClO<SUB>4</SUB> aqueous medium in which the solution had been equilibrated with precipitates of beryllium hydroxide and the supernatant was subjected to titration, we found Be<SUB>6</SUB>(OH)<SUB>8</SUB><SUP>4+</SUP> instead of Be(OH)<SUB>2</SUB>. From a very slow equilibrium observed in the high pH region, we concluded that the Be(OH)<SUB>2</SUB> complex formed by the addition of an alkaline solution gradually polymerizes to Be<SUB>6</SUB>(OH)<SUB>8</SUB><SUP>4+</SUP> by releasing some OH<SUP>−</SUP> ions. Through these observations a critical survey is described for the species reported by various authors. The solvent effect on the formation constants of hydroxo complexes is also discussed.
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