A study of the fluorides of some multivalent metals by potentiometric titration in nonaqueous media

Atomic Energy ◽  
1962 ◽  
Vol 11 (6) ◽  
pp. 1208-1210
Author(s):  
A. P. Kreshkov ◽  
V. A. Drozdov ◽  
E. G. Vlasova ◽  
S. V. Vlasov ◽  
Yu. A. Buslaev
Keyword(s):  
Potentiometric Titration ◽  
Nonaqueous Media

Conductimetric and potentiometric investigation of effect of acidity on formation of homoconjugates in acetonitrile solvent

1990 ◽  
Vol 68 (5) ◽  
pp. 674-678 ◽  
Author(s):  
Turgut Gündüz ◽  
Esma Kiliç ◽  
Güleren Özkan ◽  
Muhammed F. Awaad ◽  
Mustafa Tastekin
Keyword(s):  
Carboxylic Acids ◽  
Potentiometric Titration ◽  
Major Part ◽  
Nitrogen Atmosphere ◽  
Nonaqueous Media ◽  
Potentiometric Titrations ◽  
End Point ◽  
Titration Curves ◽  
Aliphatic Carboxylic Acids ◽  
Conjugate Base

In the present work, 11 aromatic and nine aliphatic carboxylic acids, namely benzoic, 2-nitrobenzoic, 3-nitrobenzoic, 4-nitrobenzoic, 2,4-dinitrobenzoic, 3,5-dinitrobenzoic, 2-aminobenzoic, 3-aminobenzoic, 4-aminobenzoic, o-phthalic, salicylic, formic, acetic, monochloroacetic, dichloroacetic, trichloroacetic, propionic, n-butyric, caprylic, and myristic acids, were titrated conductimetrically and potentiometrically with triethylamine in acetonitrile solvent, under a nitrogen atmosphere, at 25 °C. Closer investigation of the conductimetric titration curves of these acids showed that the acidity of an acid, rather than the basicity of its conjugate base, plays a major part in the formation of homoconjugate ions, at least in acetonitrile solvent. If the acid is strong enough, there is a maximum before the experimental end point at about the half-neutralization point. To determine the minimum strength for an acid to show this maximum before the end point, all acids were also titrated potentiometrically. It was found that those acids which have half-neutralization potentials over −85 mV give a strong homoconjugation reaction and show a maximum before the experimental end point. Moreover, the acids that show maxima before the experimental end point in the conductimetric titration also show rather well-shaped potentiometric titration curves. Keywords: nonaqueous media, conductimetric titrations, potentiometric titrations, titration in acetonitrile, acidity and homoconjugation.

The effect of solvation by acetone on the basicity of silylalkylamines

1979 ◽  
Vol 44 (9) ◽  
pp. 2828-2831 ◽  
Author(s):  
Zlata Papoušková ◽  
Vlasta Fialová ◽  
Václav Chvalovský
Keyword(s):  
Potentiometric Titration ◽  
Electronic Interaction ◽  
Relative Basicity

The relative basicity of fifteen methylethoxysilylalkylamines of the type (CH3)3-m(C2H5O)m.Si(CH2)nNH2 in acetone has been studied by potentiometric titration. For n 1 the basicity increases with increasing m, which is likely due to increasing electronic interaction of the oxygen of acetone with the silicon of silylalkylamines. The basicity of silylmethylamines (n = 1) changes nonsystematically, probably as a consequence of the competing action of opposite effects.

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