Determining the Thermodynamic Characteristics of Copper(II) Compounds in Aqueous Solutions by Potentiometric Titration with a Copper Indicator Electrode

The possibility of using potentiometric titration with a copper indicator electrode to determine the solubility product of copper (II) dicarboxylates and the stability constants of Cu (II) complexes with dicarboxylate ligands is explored. The “Cu (II) –succinic acid in an aqueous solution” system is studied. Although the titration curve depends on both the solubility product and stability constants of some complexes, solubility product is the only parameter that can be determined from the titration curve in actual practice. The determined solubility product (KSP) of copper (II) succinate CuC4H4O4⋅2H2O in water is as follows: in a temperature range of 21–40°C, the common logarithm {K{ₒ₏}} (CuC4H4O4⋅2H2O) is −6. 7 ± 0. 1.