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Use of carbon indicating electrodes in potentiometric neutralization titrations. IV. Carbon electrodes in acetic anhydride and anhydrous acetonitrile media

J. Berčík, M. Čakrt, and Z. Hladký

Institut für analytische Chemie der Slowakischen Technischen Hochschule, Bratislava 1

 

Abstract: Tetramethylammonium iodide, tetraethylammonium iodide, trimethyl - phenylammonium iodide, trimethyllaurylammonium chloride (septonex), pyridine, dimethylformamide, dimethyl sulfoxide, and hydroxyethyltheophylline were titrated potentiometrically in the medium of acetic anhydride by using the carbon electrode activated by the oxidation with 0.2 M-KMn04 in 0.5 M-H2S04 and subsequent reduction with 0.05 M-SnCl2 in 1 м-HCl. Diphenylguanidine, morpholine, N-ethylpiperidine, aniline, N,N-dimethylaniline, N,N-diethylapiline, pyridine, α-picoline, and 8-hydroxyquinoline were titrated potentiometrically in the medium of anhydrous acetonitrile. In this case the indication carbon electrode was activated by the oxidation with an acidified solution of potassium permanganate. I t was the 0.05 N solution of HCl04 which was used as titrating agent in both cases. The standard deviation did not exceed 0.3 μval for an individual determination of 0.1 mval of base.

Full paper in Portable Document Format: 244a290.pdf (in German)

 

Chemical Papers 24 (4) 290–297 (1970)

Tuesday, August 20, 2019

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