Calorimetric enthalpy of reaction of cobalt(III) with iron(II) in aqueous perchloric acid, and the standard electrode potential for cobalt(III)-(II)
Abstract
Literature measurements of ΔH for CoIII+ FeII differ markedly, leading to very different estimates of E° for CoIII+ e = CoII. The present measurement gives, respectively, –94.3 kJ mol–1, and 1.73 V (25°C, ∼2.3 mol dm–3 HClO4) estimated with an assumed spin-only entropy change.