Dynamics of Ion Pairing in Dilute Aqueous HCl Solutions by Spectroscopic Measurements of Hydroxyl Radical Conversion into Dichloride Radical Anions.

ABSTRACT: The rate of formation of dichloride anions (Cl₂^•-) in dilute aqueous solutions of HCl (2-100 mmol·kg^-1) was measured by the technique of pulse radiolysis over the temperature range of 288-373 K. The obtained Arrhenius dependence shows a concentration averaged activation energy of 7.3 ± 1.8 kJ·mol^-1, being half of that expected from the mechanism assuming the ^•OHCl^- intermediate and supporting the ionic equilibrium-based mechanism, i.e., the formation of Cl₂^•- in the reaction of ^•OH with a hydronium-chloride (Cl^-·H₃O⁺) contact ion pair. Assuming diffusion-controlled encounter of the hydronium and chloride ions and including the effect of the ionic atmosphere, w

SUBMITTER: Kazmierczak L 

PROVIDER: S-EPMC8404193 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature