The Protonation Constants of Some Aliphatic Alkylamines in ethanol-water Mixtures

Authors : Esma KILIÇ, Gültekin GÖKÇE, Esin CANEL

Pages : 843-851

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Protonation constants of methyl-, ethyl-, propyl- and butylamines Were determined potentiometrically using an electrode system calibrated in concentration units of hydrogen ion in ethanol-water mixtures insert ignore into journalissuearticles values(10% -80% ethanol, v/v); at an ionic strength of 0.1 and at 25°C. The trend in the values of protonation constants of these aliphatic amines was explained in terms of the number of alkyl groups and solvent composition. The basicity orders were found to be NH3 < R3N < RNH2 < R2NH insert ignore into journalissuearticles values(R:-CH3, -C2H5, -n-C3H7 and --n-C4H9); in all the solvent mixtures studied.
Keywords : Aliphatic amines, potentiometry, protonation constant, ethanol water mixtures