
%0 Journal Article
%A Kratsis, Steven 
%A Hefter, Glenn 
%A May, Peter M. 
%A Sipos, Pal 
%T Thermodynamics of Protonation and Sodium Binding of Sulfate in Concentrated NaCl and CsCl Solutions Studied by Raman Spectroscopy
%J Australian Journal of Chemistry
%D 2000/07/27
%V 53
%N 5
%P 363-367
%K Caesium chloride; enthalpy; entropy; ion pair; protonation; Raman spectroscopy; sodium chloride; sulfate.
%R https://doi.org/10.1071/CH00011
%U https://www.publish.csiro.au/paper/CH00011 
%X The protonation constant (pKa) of SO42&#8211;(aq) has been determined at ionic strengths 0.5 M &#x2264;I &#x2264;4.0 M in NaCl and CsCl media at 25&#x02DA;C by using Raman spectroscopy. These data were used to calculate the association constant of the NaSO4&#8211;(aq) ion pair in CsCl media. The results are in excellent agreement with previous values obtained by other techniques. The (pKa) was also measured at I = 4 M in both media at temperatures up to 85&#x02DA;C and the associated enthalpy and entropy changes were calculated. However, reliable thermodynamic data for the ion-pairing reaction could not be obtained at higher temperatures probably because of competition from CsSO4&#8211;(aq). 
