Saturated and undersaturated KCI-calomel half-cells were subjected to temperature changes between 22.5 and 31.3° C and the difference in electromotive force (emf) between them and saturated calomel half-cells at 25° C was measured. During an 8° C change, maximum differences of 0.5 to 0.9 mv were found between the measured emf values and the equilibrium emf values corresponding to the temperature of the KCl solutions. Potentials within 0.2 to 0.3 mv of the equilibrium value were obtained in 2 to 3 hours after an 8° C change. Calomel half-cells protected with dewar flasks against small fluctuations in room temperature were more stable in potential than the unprotected cells. The saturated half-cell had a tlE/tlT of 0.25 mv/oC and the undersaturated h alf-cell, 3.8 N, gave the value 0.47 mv/o.C One half-cell, saturated at 25° C. without an excess of KCl crystals, was measured and its tlE/tlT was found to be erratic.
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