Mercury-mercurous acetate indicator electrode for potentiometric titrations in anhydrous acetic acid

1955 ◽  
Vol 12 ◽  
pp. 292-299 ◽  
Author(s):  
Elio Scarano ◽  
Arnaldo Ceglie
Keyword(s):  
Acetic Acid ◽  
Indicator Electrode ◽  
Potentiometric Titrations ◽  
Anhydrous Acetic Acid

Potentiometric Titration of Vanadium (V) with Iron (II) in the Presence of NTA and DTPA Using Dry-Cell Graphite Electrode

2021 ◽  
Vol 72 (3) ◽  
pp. 144-158
Author(s):  
Kavitha Kamalasekaran
Keyword(s):  
Acetic Acid ◽  
Potentiometric Titration ◽  
Graphite Electrode ◽  
Correlation Coefficients ◽  
Nitrilotriacetic Acid ◽  
Indicator Electrode ◽  
Ligand Complex ◽  
Potential Jump ◽  
Potentiometric Titrations ◽  
Dry Cell

A sensitive potentiometric titration for vanadium (V) based effect of ligands such as nitrilotriacetic acid (NTA) and diethylenetriaminepenta-acetic acid (DTPA) are reviewed. The potential iron system decreased the presence of NTA and DTPA. In this case, iron (III) increased with respect to the vanadium (IV) volume. The production of iron (III)-ligand complex has increased. This result suggested that the formation of V(V)-NTA and V(V)-DTPA complexes were less favoured than that of V(IV)-NTA and V(IV)-DTPA complexes. The calculated correlation coefficients (r) conveyed the effectiveness of the graphite electrode as the indicator electrode for the potentiometric titrations. On comparing the potential jump values, the extent of potential caused by DTPA was found to be more than that of NTA. The utilization of graphite electrode has facilitated the potentiometric titration by significantly causing larger potential jump. This method was precise and accurate as no interference of foreign ions was observed. Hence, the approach could be applied to the vanadium (V) of any samples.

scholarly journals Abraham model correlations for estimating solute transfer of neutral molecules into anhydrous acetic acid from water and from the gas phase

2015 ◽  
Vol 212 ◽  
pp. 16-22 ◽  
Author(s):  
Dawn M. Stovall ◽  
Amber Schmidt ◽  
Colleen Dai ◽  
Shoshana Zhang ◽  
William E. Acree ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Gas Phase ◽  
Solute Transfer ◽  
Abraham Model ◽  
Anhydrous Acetic Acid

Anodic oxidation of halides in anhydrous acetic acid

1973 ◽  
Vol 44 (1) ◽  
pp. 37-45 ◽  
Author(s):  
M. Mastragostino ◽  
G. Casalbore ◽  
S. Valcher
Keyword(s):  
Acetic Acid ◽  
Anodic Oxidation ◽  
Anhydrous Acetic Acid

N-Methylamino Acids in Peptide Synthesis. III. Racemization during Deprotection by Saponification and Acidolysis

1973 ◽  
Vol 51 (15) ◽  
pp. 2555-2561 ◽  
Author(s):  
John R. McDermott ◽  
N. Leo Benoiton
Keyword(s):  
Acetic Acid ◽  
Sodium Hydroxide ◽  
Hydrogen Bromide ◽  
Aqueous Sodium Hydroxide ◽  
Acid Strength ◽  
Carboxyl Group ◽  
Aqueous Sodium ◽  
Aqueous Acid ◽  
Amino Acid Analyzer ◽  
Anhydrous Acetic Acid

The racemization of N-methylamino-acid derivatives in aqueous sodium hydroxide and hydrogen bromide in anhydrous acetic acid and other solvents has been investigated by determining the products of the reaction with an amino-acid analyzer after deprotection. Whereas MeIle-OMe, Z-MeIle, and the N-unmethylated derivatives were only slightly racemized ( <2%), Z-MeIle-OMe (18–24%), Z-Ala-MeLeu-OMe (22%), and Z-Ala-MeLeu-OBu′ (7%) were appreciably racemized by aqueous sodium hydroxide. It is suggested that these derivatives racemize because of the absence of an > N—H or carboxyl group whose ionization would suppress ionization of the neighboring α-C—H bond. Z-Melle and Z-Ala-MeLeu were substantially racemized (68% in 4 h and 34% in 1 h, respectively) by 5.6 N hydrogen bromide in acetic acid. The extent of racemization by acid varied with acid strength, polarity of solvent, and time. Incorporation of label into both isomers of Ala-MeLeu from a solution of the tritiated reagent established that ionization at the α-C—H bond had occurred. No racemization was caused by aqueous acid or by hydrogen chloride.

Screened indicators in anhydrous acetic acid medium: Chromatic evaluation of their transitions

1991 ◽  
Vol 105 (1-3) ◽  
pp. 89-99 ◽  
Author(s):  
Jos� Barbosa ◽  
Elisabeth Bosch ◽  
Jos� Luis Cortina ◽  
Mart� Ros�s
Keyword(s):  
Acetic Acid ◽  
Acid Medium ◽  
Acetic Acid Medium ◽  
Screened Indicators ◽  
Anhydrous Acetic Acid
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