Abstract
The acid K 2Cr 2O 7 was titrated potentiometrically against the three bases K 2CO 3, Na 2O 3, and NaHCO 3 in molten KNO 3 at 350°. An oxygen electrode was used as an indicator electrode, while a Ag/Ag(I) electrode acted as a suitable reference electrode. At the equivalence point, a sharp drop in the potential of the indicator electrode was measured, whose magnitude depended on the base used. The points of maximum inflexion in the titration curves were identical with the theoretical quantities of the bases necessary for neutralisation of the acid. Contamination of the melt with traces of water did not affect the measured potentials.
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