Equilibria in acetic acid: ionic association constant of oxonium perchlorate, acid-base equilibrium constant of oxonium acetate, and autoprotolysisconstant of acetic acid at 105.7°

Abstract

In aqueous acetic acid, 0.114-0.152M H₂O, at 105.7°, oxonium perchlorate has limiting equivalent conductivity Λ₀ 90.7, ionic association constant K_A = [H₃O⁺ClO₄^-]/[H₃O⁺][ClO₄]f² = 0.0310 x 10⁶ and centre-to-centre distance between the ions (å = 4.84 Ǻ. The acid-base equilibrium constant for oxonium acetate KB = [ΣH₃O⁺ OAc^-]/[H₂O] increases with the dielectric constant so that -log K_B = 1.532+29.44/D. The autoprotolysis of acetic acid also increases with the dielectric constant.