SILVER-SILVER CHLORIDE THERMOCELLS AND THERMAL LIQUID JUNCTION POTENTIALS FOR POTASSIUM-CHLORIDE SOLUTIONS AT ELEVATED-TEMPERATURES

Potentials for the symmetrical thermocell (298.15°K) Ag-AgCl/KCl/AgClAg(T) have been determined for KC1 concentrations ranging from 0.0050 to 0.505 mol/kg and for temperatures as high as 548.15°K. Thermodynamic analysis of the cell has permitted evaluation of the initial state thermal liquid junction potentials (ΔTljp) over the same range of conditions, and it was found that TLjp increases in an approximately parabolic manner with AT (= T - 298.15°K). Analysis of the entropy of transport function t+S*K+ - t-S*Cl indicates that the variation of Tljp with T can be accounted for by the change in the dielectric constant of the medium. © 1979, The Electrochemical Society, Inc. All rights reserved.