ChemInform Abstract: The Manganese(III) Oxidation of Arsenic(III)/Antimony(III) in Aqueous Sulfuric Acid

ChemInform Abstract

is studied for the first time. The stoichiometry of the reaction is in accordance with the equation shown in the scheme. The reaction follows a complex rate law. The reaction orders are ∼1.2 in (Mn³⁺), ∼1.0 in (As³⁺)/(Sb³⁺), -0.8 in (H+) and -0.3 in (Mn²⁺). Mn³⁺ and MnOH+ are shown to be the active species in the oxidation reaction. In contrast to the reaction product Mn²⁺, As(V)/Sb(V) does not influence the reaction.