Solubility studies in formamide V. Solubility product of silver permanganate and standard electrode potentials of silver—silver permanganate electrode in formamide

Abstract

The solubility and solubility product of silver permanganate in formamide in sodium perchlorate solutions have been determined at 25, 30 and 35°C. The solubilities in pure formamide are found to be 5.985 x 10 −5, 6.512 x 10 −5, and 7.114x10 −5 mol 1 −1, respectively, at these temperatures, and the corresponding solubility products are 3.583 x 10 −9, 4.240 x 10 −9 and 5.060 x 10 −9 mol 2 1 −2. The standard potentials of the Ag(s)/AgMnO 4(s)/MnO − 4 electrode have been calculated and found to be 0.2055 V, 0.1964 V, and 0.1872 V at 25, 30, and 35°C, respectively. The mean activity coefficients of silver permanganate at various rounded molarities of sodium perchlorate solutions, and the standard thermodynamic quantities for the process AgMnO 4(s)→Ag +(solvated)+MnO − 4(solvated) have been calculated at these three temperatures.