title: Association constants for the NaSO(4)(-) ion pair in concentrated cesium chloride solutions.
abstract: Values of the association constant, beta(NaSO(4)(-)), for the weak ion-pair formed by sodium and sulfate ions in aqueous solution have been determined at 25 degrees C by high precision sodium ion-selective electrode potentiometry in solutions of ionic strength ranging from 0.50 to 7.00 M in CsCl media and in 1.00 M Me(4)NCl. The data in CsCl media were fitted to an extended form of the Debye-Hückel equation which yielded log beta(NaSO(4)(-))(0)=0.834+/-0.005 at infinite dilution. Evidence is also presented for the formation of very weak ion-pairs between Cs(+) and SO(4)(2-).
authors.affiliation: Department of Chemistry, Murdoch University, Murdoch, WA 6150, Australia.
authors.forename: S G
authors.initials: SG
authors.lastname: Capewell
authors.forename: G T
authors.initials: GT
authors.lastname: Hefter
authors.forename: P M
authors.initials: PM
authors.lastname: May