%0 Journal Article
%T Estudio de la hidr¨®lisis del ion Niquel(II) y de la formaci¨®n de los complejos de Niquel(II) con los ¨¢cidos Picol¨ªnico y Dipicol¨ªnico en NaCl 1,0 mol.dm-3 a 25¡ãC
%A Lu¨ªs Veliz
%A Jos¨¦ Daniel Mart¨ªnez
%A Mary Lorena Araujo
%A Felipe Brito
%J Avances en Qu¨ªmica
%D 2011
%I Universidad de los Andes
%X The hydrolysis products (hidroxylated complexes) of Nickel(II) ion and the complex species formed in aqueous solution (25oC, I = 1.0 mol.dm 3 NaCl ionic medium) between Ni(II) cation and the ligands: picolinic acid (Hpic) and dipicolinic acid (H2dipic), have been studied potentiometrically. In the application of the least-squares computer program, LETAGROP, to the experimental emf(H) data, were observed the formation of the hydrolysis products [Ni(OH)]+, [Ni(OH)2] and [Ni4(OH)4]4-. Additionally, were detected the formation of the complexes [Ni(pic)]+, [Ni(pic)2] and [Ni(pic)3]- with picolinic acid and the species [Ni(dipic)] and [Ni(dipic)2]2- with dipicolinic acid. The stability constants of the complexes formed were determined by potentiometric measurements.
%K Nickel(II) hydrolysis
%K Nickel(II) complexes
%K solution equilibria
%K potentiometric studies
%K stability constants
%K speciation
%U www.saber.ula.ve/bitstream/123456789/33366/1/articulo1.pdf