Influence of Dielectric Constant of Medium on Stability Constants of 4-Amino-3-Naphthol-Sulphonic Acid and its Complex with Cu (II) Ions

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In the present investigation the influence of dielectric constant of the medium on complex equilibria have been studied by determining the pK and logK values of 4-amino-3-naphthol-sulphonic acid and its complex with Cu (II) metal ions in different percentage of ethanol-water mixtures at constant ionic strength (μ=0.01M). The formation of 1:1 and 1:2 complex of 4-Amino-3-Naphthol-Sulphonic Acid with Cu (II) metal ion have been observed. The data obtained is used to know the exact nature of the electrostatic forces of attraction between metal ion and negatively charged ligand by calculating the DlogK.

Dielectric constant; Stability constants; Cu (II) ions