Abstract
The use of the Nb–Nb 2O 5 electrode as an oxide ion indicator electrode in potentiometric titrations between acids and bases in fused salts was investigated. Two oxide ion acceptors (acids), NaPO 3 and Na 4P 2O 7 were titrated with oxide ion donors (bases) in fused KNO 3. The reaction was carried out at 625 K and the bases used in these titrations are K 2CO 3 and Na 2O 2. The electrode was found to serve as an excellent indicator for acid base potentiometric titrations in fused salts. It serves also as an oxide ion indicator for the titration of mixtures of acids in which chemical transformations are taking place during the course of titration. The experimental results were discussed in terms of the potential arrests and potential shifts upon the addition of the oxide ion donor to the acid.
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