Ultrasonic investigation of molecular interactions in aqueous alkaline solution of mono azo dye metanil yellow and hexacyanoferrate(III) ions

In order to investigate the nature of molecular interaction in the reaction mixture of metanil yellow with hexacyanoferrate (III) ions in basic medium, ultrasonic velocity was measured over wide ranges of concentrations. The different acoustic parameters such as adiabatic compressibility (βad), intermolecular free length (Lf), acoustical impedance (Z), relaxation time (τ) and Gibb’s free energy (ΔG) were calculated at 7 MHz utilizing ultrasonic interferometer at temperature 313 K. The experimental information for ultrasonic velocity (u), viscosity (η) and density (ρ) of the solutions for various concentrations have been utilized to ascertain these parameters. The variation of these parameters with concentration of solute indicates the nature of interaction present in the binary mixture. The results are depicted in terms of molecular interaction between the components of the solutions