The pressure effect on conductances of KCl in ethanol-water mixtures at 25.DEG.C.
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概要
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The molar conductances of KCl in 5, 10, 15, 20, and 30 mol% ethanol–water mixtures were measured in the dilute concentration range of (2–8)×10<SUP>−4</SUP> M (1 M=1 mol dm<SUP>−3</SUP>) at 25 °C up to 1500 kgf cm<SUP>−2</SUP> (1 kgf cm<SUP>−2</SUP>=0.9807×10<SUP>5</SUP> Pa). The Fuoss-Onsager conductance equation for unassociated electrolytes was used to determine the limiting molar conductance, <I>Λ</I>°, of KCl in 5 and 10 mol% of ethanol. In 15, 20, and 30 mol% of ethanol, where the ionic association takes place, the Shedlovsky equation was employed to obtain <I>Λ</I>° and the association constant <I>K</I><SUB>A</SUB> of KCl. The limiting ionic molar conductances of the K<SUP>+</SUP> and Cl<SUP>−</SUP> ions were determined by combining <I>Λ</I>° with the limiting transference number for KCl. The Walden products of both K<SUP>+</SUP> and Cl<SUP>−</SUP> ions decrease with an increase in the pressure in 5 mol% of ethanol, but in 15 mol% of ethanol and above they increase with an increase in the pressure. These facts indicate that the breaking effect of these ions appears prominently in about 5 mol% of ethanol.
- 公益社団法人 日本化学会の論文
著者
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Shimizu Kiyoshi
Deparment of Applied Chemistry, Faculty of Engineering, Doshisha University
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Ueno Masakatsu
Department of Applied Chemistry, Faculty of Engineering, Doshisha University
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Tsuchihashi Noriaki
Department of Applied Chemistry, Faculty of Engineering, Doshisha University
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