Conductivity of Manganese(II) Sulfate in Aqueous Solution at Various Temperatures

Abstract The molar conductivity of manganese(II) sulfate, MnSC4, in aqueous solution was measured in a temperature range of 10–45°C. The acquired data were analyzed by the Quint-Viallard equation, and the resulting ion association constant, KA, was used in the Bjerrum equation to determine the contact ion size, RB. The limiting ionic molar conductivity λ0 (1/2 Mn2+) for the manganese ion at 15, 25, 35, and 45°C are 40.8, 53.1, 65.2, and 79.8 S cm2 mol−1, respectively. The resulting thermodynamic properties for the ion association reaction are: ΔG°298=−13.5 kJ mol−1, ΔH°=7.91 kJ mol−1, and ΔS°298=74.1 JK−1 mol−1.