Determination of trace amounts of water in propylene carbonate using the proton isoconcentration technique

Abstract

Direct potentiometry of the system propylene carbonate (PC)-0–1%m/m water-10^–3M perchloric acid as a solution in glacial acetic acid, using glass pH and silver-silver chloride reference electrodes with a filling solution of saturated tetraethylammonium chloride in PC, shows a large systematic change in potential with variations in water concentration. This technique allows the fast and accurate determination of residual water in binary propylene carbonate mixtures.