Proton affinities of sulfate and bisulfate ions

Abstract

The decomposition of (NH4)2SO4(s) has been studied by DSC. The decomposition takes place in two steps to produce NH3(g) and NH4HSO4(s) in the first and NH3(g) and H2SO4(g) in the second. Enthalpies for these reactions are 195 and 169 kJ/mole, respectively. These values permit calculation of the proton affinities of SO42- and HSO4-, and the values found are 1847 and 1338 kJ/mole, respectively. © 1987 Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest.