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The stability constants of complexes of 2-hydrazinobenzoic acid and 4-hydrazinobenzoic acid with Ni (Ⅱ), Cu (Ⅱ),Zn (Ⅱ), Cd (Ⅱ), and Hg (Ⅱ) were determined potentiometrically at different temperatures. The thermodynamic parameters,△AG°,△AH°, and