The solution equilibrium of the molybdenum(VI) complex formed by ethylenediaminediacetic acid (EDDA)
has been investigated potentiometrically and spectrophotometrically at 25 °C, pH 6.0, and different ionic
strengths ranging from (0.1 to 1.0) mol dm-3 of sodium perchlorate. Molybdenum(VI) forms a mononuclear
complex with EDDA of type (MoO3L2-). The dependence of dissociation and stability constants on the
ionic strength is described by a modified Debye−Huckel equation and by introducing two empirical
parameters. Finally, a comparison has been made between the calculated and experimental values of
stability constants.
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