Thermoelectric Powers and Transported Entropies in Aqueous Hydrochloric Acid

Abstract

The initial thermoelectric power (TEP) has been determined for hydrogen electrodes in aqueous normalHCl solutions as a function of molality from 0.002 to 0.6 mol/kg and as a function of temperature for a 10° gradient at mean temperatures of 20°, 25°, and 30°C. For each mean temperature the TEP's are analyzed by fitting the data to an equation with three constants. At rounded molalities, the TEP's that were obtained from the 25° equation have been combined with known values for the heat of transport of normalHCl in order to determine a single‐ion property, the transported entropy of the hydrogen ion. By extrapolation the standard value of this property has been determined as 5.42±0.16 normaleu , which is in agreement with literature values.

A Further Comparison of Theoretical and Experimental Limiting Slopes for the Concentration Dependence of Thermoelectric Powers in Aqueous Hydrochloric Acid at 25° and 15°C

“…The thermoelectric powers were measured using the method, electrodes, and bubblers previously described (8,9) with the following modifications:…”