The Speed of sound, density and viscosity values of binary mixtures containing P-methoxy benzoic acid (P-MBA) with Amides -Formamide, Di methyl formamide(DMF) and N-Methyl formamide (NMF) are measured from 303.15 K to 313.15K (5K interval) temperatures using standard techniques. Several thermo acoustic parameters like molar volume (Vm), isentropic compressibility (Ks), intermolecular free length (Lf), acoustic impedance (Z), surface tension (χ) and their excess parameters have been calculated from the measured values. These excess parameters have been fitted to Redlich–Kister type polynomial equation using the least square method. The determined values of partial and excess partial molar volumes (v ̅m,1 , v ̅m,2) and (v ̅Em,1 , v ̅Em,2) are drawn from ????m????. Finally, FT-IR spectra of these mixtures at different mole fractions were carried out to analyze the hydrogen bonding formation between the molecules in terms of intra or intermolecular relations