A parameterization for the activity of H+ in aqueous sulfuric acid solutions

Physics

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Atmospheric Composition And Structure, Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Cloud Physics And Chemistry

Scientific paper

Recent studies have suggested that the rates of reactions that occur on and in sulfuric acid solutions depend strongly on the activities of H2O and H+. To simplify the application of formulations for calculating rates of these reactions and thus facilitate their use in photochemical models of the atmosphere, this letter presents a parameterization for the activity of H+ based on the results of a comprehensive, but computationally intensive, thermodynamic model. The parameterization deviates from values given by the full thermodynamic model by <2% for temperatures between 186 and 326 K and sulfuric acid concentrations between 10 and 80 weight percent.

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