Conductometric Determination of Ion-pair Formation Constants of Tris(ethylenediamine)cobalt(III) Ion with Maleate and Fumarate Ions in Aqueous Solutions

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概要

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• The conductance behavior of mixtures was investigated for the systems tris(ethylenediamine)cobalt(III)chloride-sodium maleate and tris(ethylenediamine)cobalt(III)chloride-sodium fumarate in aqueous solutions of various ionic strengths at 25°C. Appreciable deviation of the measured conductivity from additivity was attributed to the ion-pair formation of tris(ethylenediamine)cobalt(III) ion with maleate Ma<SUP>2−</SUP> and fumarate Fu<SUP>2−</SUP> ions. The concentration formation constants <I>K<SUB>c</SUB></I> at various ionic strengths were determined by means of computer analysis of the deviation. The thermodynamic ion-pair formation constants <I>K</I> at 25°C were as follows: log<I>K</I>=3.60 for [Co(en)<SUB>3</SUB>]<SUP>3+</SUP>·Ma<SUP>2−</SUP> and log<I>K</I>=2.95 for [Co(en)<SUB>3</SUB>]<SUP>3+</SUP>·Fu<SUP>−2</SUP>.

• 公益社団法人 日本化学会の論文

著者

• Tamamushi Reita

  The Institute of Science and Technology, the University of Tokyo

• Katayama Shunzo

  The Institute of Physical and Chemical Research

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• Conductometric Determination of Ion-pair Formation Constants of Tris(ethylenediamine)cobalt(III) Ion with Maleate and Fumarate Ions in Aqueous Solutions

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