Kinetics of the bromate–iodide and iodate–iodide reactions by pH-stat techniques

Abstract

Buffer-free pH-stat methods were applied to kinetic investigations of the iodate–iodide and bromate–iodide reactions in the pH range 3–4 yielding the rate laws v′=k′₀[H⁺]²[I^–]²[IO^–₃] and v=k₀[H⁺]²[I^–][BrO^–₃]+k₁[H⁺][I^–][BrO^–₃]. In addition, for [I^–] and [IO^–₃] of the order of 10^–2M(M= mol dm^–3) the rate of reaction was 4th order in [I^–], 2nd order in [IO^–₃], and the order with respect to [H⁺] increased from 1st towards 3rd as [H⁺] decreased from 8 × 10^–7M to 4 × 10^–8M.