Potentiometric titration curves for lubricants

1977 ◽  
Vol 13 (3) ◽  
pp. 213-216 ◽  
Author(s):  
V. S. Luneva ◽  
T. V. Pavlova
Keyword(s):  
Potentiometric Titration ◽  
Titration Curves

Reaction of metallic nitrilotriacetates with histamine

1969 ◽  
Vol 47 (8) ◽  
pp. 1269-1273 ◽  
Author(s):  
A. L. Beauchamp ◽  
J. Israeli ◽  
H. Saulnier
Keyword(s):  
Potentiometric Titration ◽  
Formation Constants ◽  
Amino Group ◽  
Mixed Complex ◽  
Ph Values ◽  
Titration Curves ◽  
Terminal Amino ◽  
Complex Ion

Cu(II), Ni(II), Co(II), and Zn(II) nitrilotriacetates (MeX−) react with histamine nitrate (LH+) to form a protonated mixed complex MeXLH where the metal appears to be bound only to the tertiary imidazolic nitrogen of histaminium ion. At higher pH values the proton dissociates to yield a mixed complex ion MeXL− in which both the imidazolic nitrogen and the terminal amino group are coordinated. The formation constants of these species were calculated from the potentiometric titration curves.

scholarly journals Assessment of Two Theoretical Methods to Estimate Potentiometric Titration Curves of Peptides:  Comparison with Experiment

2006 ◽  
Vol 110 (9) ◽  
pp. 4451-4458 ◽  
Author(s):  
Joanna Makowska ◽  
Katarzyna Bagiñska ◽  
Mariusz Makowski ◽  
Anna Jagielska ◽  
Adam Liwo ◽  
...  
Keyword(s):  
Potentiometric Titration ◽  
Theoretical Methods ◽  
Titration Curves ◽  
Comparison With Experiment

Automatic titrator for digital recording of potentiometric titration curves

1974 ◽  
Vol 46 (9) ◽  
pp. 1362-1364 ◽  
Author(s):  
J. J. Kankare ◽  
P. O. Kosonen ◽  
P. O. Vihera
Keyword(s):  
Potentiometric Titration ◽  
Digital Recording ◽  
Titration Curves ◽  
Automatic Titrator

Determination of acids and their strength in isobutyl methyl ketone

1982 ◽  
Vol 47 (4) ◽  
pp. 1203-1215 ◽  
Author(s):  
Vladimír Dostál ◽  
Zdeněk Stránský ◽  
Jan Slouka
Keyword(s):  
Potentiometric Titration ◽  
Malonic Acid ◽  
Methyl Ketone ◽  
Dissociation Constants ◽  
Weak Acids ◽  
Titration Curves ◽  
Derivatives Of

The dissociation constants of nitrophenoxazines in isobutyl methyl ketone (MIBK) were determined and correlated with the HNP values in acetone. Of the derivatives studied, the strongest acid is 1,3,7-trinitrophenoxazine (pK = 19.8), the weakest, 1-nitrophenoxazine (pK > 26). The compounds have no tendency to homo- or heteroconjugation, and were used as indicators in determination of weak acids in MIBK. Some derivatives of malonic acid and of 1,2,4-triazine as well as the intermediates used in their synthesis were determined; their HNP and pK values were established. The shape of the potentiometric titration curves can be of assistance in solving some structure problems.

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.

Potentiometric titration curves of oxidized and reduced horse heart cytochrome c

Biopolymers ◽  
1980 ◽  
Vol 19 (4) ◽  
pp. 885-898 ◽  
Author(s):  
M. A. Marini ◽  
G. E. Marti ◽  
R. L. Berger ◽  
C. J. Martin
Keyword(s):  
Cytochrome C ◽  
Potentiometric Titration ◽  
Horse Heart Cytochrome ◽  
Titration Curves ◽  
Horse Heart Cytochrome C
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