ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Use of carbon indicator electrodes in potentiometric neutralization titrations. I. Graphite electrode in the mixed ethylene glycol-acetone medium
J. Berčík and M. Čakrt
Department of Analytical Chemistry, Slovak Technical University,
Abstract: In this paper, the application of an impregnated graphite indication electrode for
Potentiometrie titrations in ethyleneglycol—acetone (2:1) was examined. By immersing
the electrode into the aqueous 1 N-KMn04 in 1 N-H2S04 for 5 minutes the surface becomes
activated forming a system the oxidation-reduction potential of which is dependent upon
the activity of solvated protons.
The results obtained when titrating acetic, monochloroacetic, trichloroacetic, phenylacetic, benzoic, o-chlorobenzoic, 3,5-dinitrobenzoic, hydrochloric, perchloric, nitric, formic,
oxalic acid and the mixture acetic acid — trichloroacetic acid in ethyleneglycol — acetone
2 : 1 by volumetric solution of sodium propanol-2-ate in 2-propanol are of the same accuracy
as when glass electrode was used.
The advantage of the graphite electrode in non-aqueous solutions is mainly the low
inner resistance and its duration.
Full paper in Portable Document Format: 2210a755.pdf (in Slovak)
Chemical Papers 22 (10) 755–760 (1968)
Saturday, August 08, 2020