Electrometric determination of cu (ii) cations, Zn (ii) and Cr (iii) in aqueous, water-non-aqueous and mixed solutions

This work presents the results of the potentiometric determination of aqueous, non-aqueous and mixed solvents of copper (II), zinc (II) and chromium (III) cations: (propanol-2, acetone, methyl ethyl ketone, toluene, carbon tetrachloride, dimethylformamide) and their mixtures with water in a ratio of 1:1 and 1:19 by volume, the ratios of acid-base titrations are given. The quantitative results of the titration on a per kilote basis for the indicated cations Cu2+, Zn2+ and Cr3+ are based on the acidity constants of these cations assessed in the solvent environment specified above. The influence of the physical and chemical properties of solvents on acid-base titrations was studied. Due to the increase in the proportion of non-aqueous solvent in the solution, the dielectric constant of the solution decreases, and this leads to an increase in the ability to quantify acid-base titrations.