Studies on the application of the quinhydrone electrode in formamide. III. The ionization constants and related thermodynamic quantities of phthalic acid frome.m.f. measurements at different temperatures

Abstract

The first and second ionization constants of phthalic acid have been determined, in formamide, at temperatures ranging from 5° to 45°C at 5° intervals, with the help of cells without liquid junction using quinhydrone and silver-silver chloride electrodes. By means of the Bjerrum equation, the distance r between the acidic groups has been estimated in formamide at different temperatures.