Formation constants of aluminum(III)-maleate complexes determined by potentiometric titration

Complex formation constants for the complexation of Al 3+ with maleate ion have been determined by potentiometric titration. Limiting values of (3±1)×10 5 and (2±1)×10 3 are obtained for K 1 and K 2 respectively, at the temperature of 25 o C. Maleate behaves as a bidentate ligand, which is consistent with its behavior toward other metal(III) ions