Abstract
Coulometric generation of hydrogen ions by the oxidation of ascorbic acid, 1,4-naphthohydroquinone and 2,6-naphthohydroquinone in anhydrous acetonitrile and in acetic acid-acetic anhydride is described. Current—voltage curves for solvents, indicator, titrated bases and depolarizer show that all three depolarizers are oxidized at potentials more negative than those of bases and other components in the solution. Titrations of sodium acetate and potassium hydrogenphthalate in acetic acid-acetic anhydride (1:6), and of triethanolamine, p-toluidine and γ-picoline in acetonitrile, with hydrogen ions generated at a platinum anode by the oxidation of these depolarizers, proved that ascorbic acid and 1,4-naphthohydroquinone are successful. With ascorbic acid, the current efficiency was 100 ± 0.3%.
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