title: Ionic medium effects on equilibrium constants Part I. Proton, copper(II), cadmium(II), lead(II) and acetate activity coefficients in aqueous solution.
abstract: The molar single ion activity coefficients associated with hydrogen, copper(II), cadmium(II) and lead(II) ions were determined at 25 degrees C and ionic strengths between 0.100 and 3.00 M (NaClO4), whereas for acetate the ionic strengths were fixed between 0.300 and 2.00 M, held with the same inert electrolyte. The investigation was carried out potentiometrically by using proton-sensitive glass, copper, cadmium and lead ion-selective electrodes and a second-class Hg|Hg2(CH3COO)2 electrode. It was found that the activity coefficients of these ions (y(i)) can be assessed through the following empirical equations: log y(H) = -0.542I(0.5) + 0.451I; log y(Cu) = -1.249I(0.5) + 0.912I; log y(Cd) = -0.829I(0.5) + 0.448I(1.5); log y(Pb) = -0.404I(0.5) + 0.117I(2); and log y(Ac) = 0.0370I
authors.affiliation: Departamento de Química Orgânica, Instituto de Química, UNESP, Araraquara, SP, Brazil.
authors.forename: L
authors.initials: L
authors.lastname: Pezza
authors.forename: M
authors.initials: M
authors.lastname: Molina
authors.forename: M
authors.initials: M
authors.lastname: de Moraes
authors.forename: C B
authors.initials: CB
authors.lastname: Melios
authors.forename: J O
authors.initials: JO
authors.lastname: Tognolli