The densities and ultrasound velocities in azithromycin solutions in ethanol, 1-propanol and 1butanol at various concentrations and at three different temperatures (T = 300.15, 305.15, and 310.15 K) have been measured. Based on the data obtained, various derived acoustical parameters viz, acoustic impedance (Z), adiabatic compressibility (β), intermolecular free length (L f ), free volume (V f ), Rao's constant (R), Wada's constant (W), partial molar volume (V Ф ), and hence apparent molar volume ( ) of the solute have been calculated. The results are discussed on the basis of the nature of solute-solvent interactions.
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