Abstract: Density (ρ), viscosity (η) and ultrasonic velocity (U) have been measured for L-glutamine, L-arginine and L-lysine in aqueous magnesium acetate (0, 0.5 and 1 mol kg-1) at 298.15K. These measurements have been performed to evaluate some important parameters viz., adiabatic compressibility (β), molal hydration number (nH), apparent molal compressibility (φK), apparent molal volume (φV), limiting apparent molal compressibility (φ0K), limiting apparent molal volume (φ0V) and their constants (SK, SV), transfer adiabatic compressibility (Δ φ0K), transfer volume (Δ φ0V) and viscosity A and B-coefficient of Jones-Dole equation. These parameters have been interpreted the molecular interactions in terms of ion-ion and ion-solvent interaction present in the given solutions.