Conductivity Measurements of Alkali Metal Thiocyanates in Water-Methanol Mixtures

Conductivity Measurements of Alkali Metal Thiocyanates in Water-Methanol Mixtures

The conductivity of several alkali metal thiocyanates in water-methanol mixtures was measured at 25°C. The data were analyzed using the Lee-Wheaton theory for symmetrical electrolytes to obtain ion association constant, KA, limiting molar conductivity, δ0, and limiting ionic molar conductivity, λ0±....

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Veröffentlicht in:Nippon Kagakukai shi (1972) 1999-03, Vol.1999 (3), p.203
Hauptverfasser: KUBOTA, Eiji, HORIMOTO, Sanaki
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HORIMOTO, Sanaki
description The conductivity of several alkali metal thiocyanates in water-methanol mixtures was measured at 25°C. The data were analyzed using the Lee-Wheaton theory for symmetrical electrolytes to obtain ion association constant, KA, limiting molar conductivity, δ0, and limiting ionic molar conductivity, λ0±. In all the solvent systems, calculated λ0+ values of the alkali metal ions increase in the order Li+
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The data were analyzed using the Lee-Wheaton theory for symmetrical electrolytes to obtain ion association constant, KA, limiting molar conductivity, δ0, and limiting ionic molar conductivity, λ0±. In all the solvent systems, calculated λ0+ values of the alkali metal ions increase in the order Li+&lt;Na+&lt;K+&lt;Rb+&lt;Cs+. The.λ0± values of the alkali metal ions and thiocyanate ion showed a minimum whe n the molar fraction of methanol was ca.0.4. The changes in λ0± of these alkali metal ions and thiocyanate ion with the molar fraction of methanol agree with the change in the viscosity of the solvent or the heat of mixing of water-methanol mixtures. These alkali metal thiocyanates form little or no ion aggregated in water and water-methanol mixtures. 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The data were analyzed using the Lee-Wheaton theory for symmetrical electrolytes to obtain ion association constant, KA, limiting molar conductivity, δ0, and limiting ionic molar conductivity, λ0±. In all the solvent systems, calculated λ0+ values of the alkali metal ions increase in the order Li+&lt;Na+&lt;K+&lt;Rb+&lt;Cs+. The.λ0± values of the alkali metal ions and thiocyanate ion showed a minimum whe n the molar fraction of methanol was ca.0.4. The changes in λ0± of these alkali metal ions and thiocyanate ion with the molar fraction of methanol agree with the change in the viscosity of the solvent or the heat of mixing of water-methanol mixtures. These alkali metal thiocyanates form little or no ion aggregated in water and water-methanol mixtures. 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The data were analyzed using the Lee-Wheaton theory for symmetrical electrolytes to obtain ion association constant, KA, limiting molar conductivity, δ0, and limiting ionic molar conductivity, λ0±. In all the solvent systems, calculated λ0+ values of the alkali metal ions increase in the order Li+&lt;Na+&lt;K+&lt;Rb+&lt;Cs+. The.λ0± values of the alkali metal ions and thiocyanate ion showed a minimum whe n the molar fraction of methanol was ca.0.4. The changes in λ0± of these alkali metal ions and thiocyanate ion with the molar fraction of methanol agree with the change in the viscosity of the solvent or the heat of mixing of water-methanol mixtures. These alkali metal thiocyanates form little or no ion aggregated in water and water-methanol mixtures. These alkali metal thiocyanates were KA=15-24 dm3 mol-1 in methanol.</abstract><cop>Tokyo</cop><pub>Japan Science and Technology Agency</pub><doi>10.1246/nikkashi.1999.203</doi><oa>free_for_read</oa></addata></record>
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