Differential electrolytic potentiometry with periodic polarisation. Part XXIX. Precipitation and complexation titrations in anhydrous acetic acid

Abstract

The applications of direct current and mark-space biased square wave differential electrolytic potentiometry alongside zero-current potentiometry to single and mixed halide precipitation titrations with silver(I), to single halide precipitation or complexation titrations with mercury( I) and to single halide complexation titrations with mercury(I1) in anhydrous acetic acid media have been examined, using silver, silver amalgam and gold amalgam electrodes. Mercury(1) offers no advantage over silver, which gives excellent results for single halides, particularly with silver electrodes, and chloride and bromide mixtures are fully resolved in this medium as well as chloride and iodide, particularly with silver amalgam electrodes, while bromide and iodide titrate to total halide only : chloride, bromide and iodide mixtures are resolved, but not accurately. The mercury(I1) titrations are much improved in the anhydrous medium with respect to water ; gold amalgam electrodes are favoured .

Differential electrolytic potentiometric determination of caffeine in nonaqueous media

“…Moreover, the shape of the titratiDn curve will be in the form of a sharp peak whose tip is used for the precise location of the end point. The dc DEP technique has been applied to various types of titrimetric reactions in both aqueous [ 1-41 and nonaqueous [5][6][7][8] media using different types of indicating systems. Antimony metal-metal oxide electrodes are appropriate for acid-base reactions [l-31, while silver electrodes have been used mainly for precipitation reactions (4,6].…”

“…The dc DEP technique has been applied to various types of titrimetric reactions in both aqueous [ 1-41 and nonaqueous [5-8] media using different types of indicating systems. Antimony metal-metal oxide electrodes are appropriate for acid-base reactions [l-31, while silver electrodes have been used mainly for precipitation reactions (4,6]. Platinum electrodes have been applied in oxidation-reduction reactions [9].…”

“…A mixture of toluene and methanol has been used for acid-base reactions [7]. Acetic acid has been used as a solvent for both oxidation-reduction reactions and precipitation reactions [6,9]. Propylene carbonate has been employed for oxidation-reduction reactions [ 101.…”