ISSN:
1572-8927
Keywords:
4-Methylpyridine
;
protonation constant
;
partition coefficient
;
potentiometric titration
;
thermodynamic constants
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01075137
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