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 behavior of graphite-epoxy electrochemical transducers towards anions, cations and pH...

Silver and Silver Chloride Electrodeposits, an Alternative in the Construction of Ag/AgCl Solid Elec...

Nucleation and Growth Kinetics of Electrodeposited Sulfate-Doped Polypyrrole: Determination of the D...

Magnetic solid phase extraction based on phenyl silica adsorbent for the determination of tetracycli...

Synthesis, characterization, and crystal structures of n-alkyldiorganodithiophosphates RS2P(OC6H4)2

Sequential Injection Spectrophotometric Determination of Diclofenac in Urine and Pharmaceutical Form...

Determination of non-steroidal anti-inflammatory drugs in wastewaters by magnetic matrix solid phase...

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

Chemical studies of anthocyanins: A review

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