Potentiometric Titration of Na₂HAsO₄, NaPO₃, Na₄P₂O₇, and their Binary Mixtures in NaNO₃ Melt at 350°C Using a Novel Solid State Glass/TiO₂ as pH Indicator Electrode

A solid‐state glass/TiO₂ electrode was fabricated using a transparent conductive titanium oxide film on a glass substrate. The coating of the glass substrate was achieved by a novel simple chemical vapor deposition (CVD) procedure. This electrode can be used as an indicator electrode in potentiometric acid‐base titration. This electrode behaves reversibly and responds to the oxide ion concentration in molten NaNO₃ · Na₂HAsO₄, NaPO₃, Na₄P₂O₇, and their binary mixtures were potentiometrically titrated with Na₂O₂ as titrants in molten NaNO₃ at 350°C, using the above mentioned indicator electrode.

Keywords:

• Titanium oxide
• conductive thin film titanium oxide
• indicator electrode
• potentiometric titration

This work was accomplished through a grant from the Deanery of Scientific Research in the Al‐Azhar University of Gaza.