CONDUCTIVITY OF MANGANESE(II) SULFATE IN AQUEOUS-SOLUTION AT VARIOUS TEMPERATURES

The molar conductivity of manganese(II) sulfate, MnSO4, in aqueous solution was measured in a temperature range of 10-45-degrees-C. The acquired data were analyzed by the Quint-Viallard equation, and the resulting ion association constant, K(A), was used in the Bjerrum equation to determine the contact ion size, R(B). The limiting ionic molar conductivity lambda-0 (1/2 Mn2+) for the manganese ion at 15, 25, 35, and 45-degrees-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: DELTA-G-degrees 298 = -13.5 kJ mol-1, DELTA-H-degrees = 7.91 kJ mol-1, and DELTA-S-degrees 298 = 74.1 J K-1 mol-1.