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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