Producción Científica Profesorado

EQUILIBRIUM CONSTANTS DETERMINATION OF ASCORBIC ACID IN AQUEOUS MEDIUM BY POLARIMETRY



Alvarez Romero, Giaan Arturo

2017

Lucero Hernández-García, Alberto Rojas-Hernández, María T. Ramírez-Silva, Giaan A. Álvarez-Romero, Manuel E. Palomar-Pardavé, Av. cien. ing., 2017, 8(1), 31-41


Abstract


In this work, the acid constants of ascorbic acid (AA) by polarimetry, with a base titration of the acid, aredetermined. The results obtained by this technique were processed by adjusting the rotation angles measuredas a function of the pH, using for the fitting the Biot and additivity laws for this property. Non-linear and linearregression models were applied. The most reliable values obtained were pKa1 = 4.149 0.022 and pKa2 =11.927 0.062, achieved by non-linear regression of the data acquired to ? = 578 nm, with standard deviationsfor the fit equal to 0.046? and 0.075?, respectively. These values are comparable with those reported usingother techniques.



Producto de Investigación




Artículos relacionados

Potentiometric quantification of saccharin by using a selective membrane formed by pyrrole electropo...

Electrochemical and AFM characterization of the electropolimerization of pyrrole over a graphiteepox...

Construction and Evaluation of a Gold Tubular Electrode for Flow Analysis: Application to Speciation...

Design and Construction of Solid State Ag/AgCl Reference Electrodes Through Electrochemical Depositi...

Potentiometric Behavior of Diverse Polypyrrole-sulphate Films Electro Synthesized on Graphite - Epox...

Synthesis and crystal structures of cis-palladium(II) and cis-platinum(II) complexes containing dipy...

cis-Palladium(II) complexes of derivatives of di-(2-pyridyl)methane: Study of the influence of the b...

Multicommutated Anodic Stripping Voltammetry at Tubular Bismuth Film Electrode for Lead Determinatio...

Potentiometric quantification of saccharin by using a selective membrane formed by pyrrole electropo...

Development of a novel composite sensor based on doped pyrrole selective to nitrate ions