Solubility of gallium(III) oxyhydroxide in aqueous NaCl solutions at 100°C |
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| Authors: | Miho Uchida Akitsugu Okuwaki |
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| Affiliation: | (1) Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aoba, Aramaki, Aoba-ku, 980-77 Sendai, Japan |
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| Abstract: | The hydrolysis-precipitation equilibrium reaction of aqueous gallium(III) solution was investigated in 0–3 mol-kg-1 NaCl media at low pH at 100°C using a pressure-tight glass vessel. All precipitates were identified as GaOOH. The results were analyzed with a nonlinear least-squares computer program to obtain the solubility product Kso for gallium(III) oxyhydroxide using a single-parameter type of Debye-Hückel equation. The value of log Kso for GaOOH(s) + 3H+ ⇆ Ga3+ + 2H2O was -0.60 at 100°C. The solubility product calculated from thermodynamic data was compared with the experimental result. |
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| Keywords: | Gallium(III) precipitation solubility product thermodynamics ionic strength |
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