Abstract
AbstractComplexation of two ligands, iminodiacetic acid and ethylenediamine‐N,N′‐diacetic acid, with molybdenum(VI) was studied in aqueous solutions. Molybdenum(VI) forms a mononuclear complex with the aforementioned ligands of the type MoO3L2−. All measurements have been carried out at 25 °C and different ionic strengths ranging from 0.1 to 1.0 mol·L−1 of NaClO4, with the pH justified to 6.0. Equilibrium concentration products and stoichiometry of the complexes have been determined from a combination of potentiometric and UV spectroscopic measurements. Comparison of the ionic strength effect on these complex formation reactions has been made using a Debye‐Hückel type equation and Bronsted‐Guggenheim‐Scatchard specific ion interaction theory (SIT). Debye‐Hückel theory predicted the first order effects on simple electrolyte solutions. Interactions between the reacting species and the ionic medium were taken into account in the SIT model. All of the calculations have been done by the computer program Excel 2000.
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