Association constants for the NaSO(4)(-) ion pair in concentrated cesium chloride solutions

S G Capewell; G T Hefter; P M May

doi:10.1016/s0039-9140(98)00346-4

Association constants for the NaSO(4)(-) ion pair in concentrated cesium chloride solutions

Talanta. 1999 Jun;49(1):25-30. doi: 10.1016/s0039-9140(98)00346-4.

Authors

S G Capewell¹, G T Hefter, P M May

Affiliation

¹ Department of Chemistry, Murdoch University, Murdoch, WA 6150, Australia.

PMID: 18967570
DOI: 10.1016/s0039-9140(98)00346-4

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-).