Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
A Possibility for Determining the Entropies of Electrolytes from the Initial Thermoelectric Powers of Thermocells
Toshio Ikeda
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1964 Volume 37 Issue 12 Pages 1768-1770


An alternative method for determining the third-law partial molar entropies of electrolytes in aqueous solutions from the data on nonisothermal systems has been presented. They can be obtained from the difference between the initial thermoelectric powers of two different thermocells, the one being formed by cation-reversible electrodes and the other being formed by anion-reversible electrodes, both with common electrolytes of the same concentration. The partial molar entropies have been calculated to be 31.59, 37.53 and 42.87 e.u. for hydrochloric acid, hydrobromic acid, and hydroiodic acid respectively at 25°C and 0.01 M.

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