Second ionization constant of sulfuric acid in H2O and D2O from 150 to 300 °C at p = 11.5 MPa using flow AC conductivity
Literature Information
Jacy K. Conrad, Hugues Arcis, Jane P. Ferguson, Peter R. Tremaine
A custom-built flow-through AC conductivity instrument was used to measure the deuterium isotope effect on the ionization quotient of bisulfate from 150 to 300 °C, at p = 11.5 MPa. Standardized solutions of KCl, HCl, KOH, KHSO4, K2SO4, and H2SO4 were prepared in light and heavy waters and their conductivities were measured and fitted with the Quint–Viallard conductivity model to obtain single ion conductivities at infinite dilution for K+, Cl−, H+, OH−, HSO4−, and SO42−. These are the first conductivities of DSO4− and SO42− measured in heavy water at any temperature, and the first ionization constants for bisulfate reported in heavy water above 225 °C. The deuterium isotope effect on the chemical equilibrium constant, ΔpK2a = pK2a,D − pK2a,H, was found to increase with temperature, in contrast to the behaviour seen for other simple oxyacids.
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