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Determination of the protonation constant and partition coefficient of 4-methylpyridine in KNO3-toluene at 25°C

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Abstract

The protonation constant in 1.0 mol-dm−3 KNO3, and partition coefficient of 4-methylpyridine (B) between 1.0 mol-dm−3 KNO3, and toluene have been determined at 25°C by measuring the H3O+ ion concentration with a glass electrode. The experimental work consisted of two sets of potentiometric titrations. In the first case, the titrations were carried out in an aqueous system of constant ionic strength and in the second, two-phase titrations using toluene as organic phase were performed. All the titrations were conducted automatically by the use of a computer controlled potentiometric system. The results were treated using graphical and numerical methods and the systematic erros were also considered. The formation constant of the protonated 4-methylpyridine was correlated with the composition of the aqueous phase by means of Bromley's theory.

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Author information

Correspondence to N. Etxebarria.

Additional information

Recently deceased. This paper is dedicated to the memory of Dr. José Maria Castresana.

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Etxebarria, N., Zapatero, M.J., Castresana, J.M. et al. Determination of the protonation constant and partition coefficient of 4-methylpyridine in KNO3-toluene at 25°C. J Solution Chem 20, 1213–1225 (1991). https://doi.org/10.1007/BF01075137

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Key words

  • 4-Methylpyridine
  • protonation constant
  • partition coefficient
  • potentiometric titration
  • thermodynamic constants