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Quantitative indication of a complex formation comes from the estimation of the stability or formation constants characterizing the equilibria corresponding to the successive addition of ligands. The binary equilibria of metal (II) / (III)--ascorbic acid and also mixed equilibria metal (II) / (III)--ascorbic acid--NTA have been studied using ionophoretic technique. The stability constants of metal--ascorbic acid binary complexes are found to be 103.77, 102.47, 10 2.77 and that of metal--ascorbic acid--NTA mixed complexes have been found to be 106.05, 105.93, 105.75, for Fe(III), Cu(II) and Co(II) complexes, respectively at 25 °C and ionic strength Ic = 0.1 mol dm-3 (HClO4). [ABSTRACT FROM AUTHOR]