Structure and basicity. Part 10. Conductometric and potentiometric titrations of some cyclotriphosphazatrienes in non-aqueous media. The conductivities of alkali-metal acetates on titration with perchloric acid in acetic acid

Abstract

Conductometric titrations of cyclotriphosphazatriene derivatives with perchloric acid in three solvent systems, (i) nitrobenzene, (ii) nitrobenzene–benzene (1 : 1), and (iii) acetic acid, are described and compared with potentiometric titrations in nitrobenzene using the same acid. Only the strongest bases can be titrated conductometrically in nitrobenzene. Acetic acid gives the largest range. The N-shaped curves in nitrobenzene–benzene (1 : 1) allow the best determinations of end-points for strong bases. The conductivities of the alkali-metal acetates in acetic acid on titration with perchloric acid are described. The shapes of the conductometric titration curves are discussed and a proton-jump mechanism is proposed for acetates in acetic acid.