Abstract
The following double galvanic cell was assembled and the thermodynamic properties of liquid Bi-Na and Sn-Na alloys, and the ion selectivity of β″-alumina during coulometric titration, were investigated. Mo, Na(I)¦β″-alumina¦M-Na(I), Mo [I] M-Na(I)¦β″-alumina¦Au + Au2Na, Mo [II] (M = Bi or Sn) where M-Na(1) and Au + Au2Na were used as the common electrode and reference electrode, respectively. Sodium was coulometrically titrated through the β″-alumina electrolyte of cell I both ways, and the EMFs were measured. It was found that no ion-exchange reaction occurs between the liquid alloys and the β″-alumina, and only Na was transferred in the β″-alumina during coulometric titrations. The thermodynamic properties of liquid Sn-Na and Bi-Na alloys were found to be in agreement with the literature.
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