Determination of equivalence points of sigmoidal potentiometric titration curves

1986 ◽  
Vol 89 (1-6) ◽  
pp. 401-409 ◽  
Author(s):  
Herbert Greschonig ◽  
Otto Glatter
Keyword(s):  
Potentiometric Titration ◽  
Titration Curves

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.

Application of the Crytur 20-15 Ca2+-selective electrode in volumetric analysis

1983 ◽  
Vol 48 (4) ◽  
pp. 1137-1143 ◽  
Author(s):  
Jaromír Kalous ◽  
Karel Vytřas ◽  
Alena Terberová
Keyword(s):  
Carboxylic Acid ◽  
Potentiometric Titration ◽  
Nitrate Solution ◽  
Volumetric Analysis ◽  
Selective Electrode ◽  
Titration Curves

Some possibilities have been studied of application of the Crytur 20-15 Ca2+-selective electrode in volumetric analysis especially for determination of the compounds which react with calcium(II) salts to form precipitates or complexes. Titrations with standard calcium(II) nitrate solution have particularly proved useful for determination of aminocarboxylic acids, but sufficiently developed potentiometric titration curves have also been obtained in titrations of fluoride, oxalate and higher carboxylic acid anions (soaps). Also reliable results have been obtained in titrations of Ca2+ besides Mg2+ with standard EGTA solution.

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