Potentiometric studies on sulfato complex of aluminium(III) in aqueous solution at elevated temperatures.

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概要

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• Equilibria in aluminium sulfate solutions with a 1 mol kg<SUP>−1</SUP> KCl medium and low pH range have been investigated by means of acidity measurements with a hydrogen ion concentration cell from 25 to 125 °C. The results were treated with a nonlinear least squares computer program to analyze the equilibrium constants for aluminium complexes by using a single parameter type of Debye–Hückel equation. The log(<I>K</I>/mol<SUP>−1</SUP> kg) values of the formation constant for the reaction, Al<SUP>3+</SUP>+SO<SUB>4</SUB><SUP>2−</SUP>\rightleftarrows[AlSO<SUB>4</SUB>]<SUP>+</SUP> varied from 3.35 at 25 °C to 5.34 at 125 °C and were formulated as a function of temperature. The standard enthalpy and entropy of the complex formation computed from the variation of the formation constant with temperature are presented over the experimental temperature range. The species [Al(SO<SUB>4</SUB>)<SUB>2</SUB>]<SUP>−</SUP> was not detected under the present conditions.

• 公益社団法人 日本化学会の論文

著者

• Matsunaga Akio

  Department of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University

• Okuwaki Akitsugu

  Department of Applied Chemistry, Faculty of Engineering, Tohoku University

• Sakai Kazuhiro

  Department of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University

• Matsushima Yoshiyuki

  Department of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University

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