Complex equilibria of DCPHD with proton and Ni2+, Sm3+, and Yb3+ ions has been measured in various mixed aqueous solvents, viz: isopropanol‐water, acetone‐water, ethanol‐water, and methanol‐water. Based on potentiometric equilibrium measurements of hydrogen ion concentration at 30°C, ionic strenght 0.10 M (KNO3) and in the above various mixed aqueous solvents, the values of the protonation constants of DCPHD and the stability constants of DCPHD with Ni2+, Sm3+, and Yb3+ have been evaluated. The variation of protonation and stability constants with the inverse of dielectric constant or mole fraction of the solvent was studied. Application of Fuoss expression and consideration of electrosatic and non‐electrostatic effects are made to explain the values of the constants.
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