University of Tehran Journal of Sciences, Islamic Republic of Iran 1016-1104 31 2 2020 04 01 Molecular Interaction Studies of Ammonium Dihydrogen Phosphate in the Aqueous Solutions of Mono, Di and Triprotic Acids – An Ultrasonic Study 121 126 74797 10.22059/jsciences.2020.280203.1007400 EN S Prabagaran Department of physics, Sacred heart College, Tirupattur - 635601, Vellore District, Tamil Nadu, India S Venkatesan Department of Chemistry, Adhiyamaan College of Engineering, Hosur, India J Udayaseelan Department of Physics, Government Thirumagal Mills College, Gudiyattam- 632 602, Tamil Nadu, India M Aravinthraj Department of Physics, Sacred Heart College Tirupattur - 635601, Vellore District, Tamil Nadu, India Journal Article 2019 05 02 Aqueous solutions of mono, di, and triprotic acids were prepared with different molar percentages (say 10%, 20% and 30%). ammonium dihydrogen phosphate is gradually introduced in the aqueous solutions at different concentrations varied from 0.1M to 0.6M at 303K. Densities, viscosities, and velocity of sound of aqueous solutions are measured and they are used to evaluate the other parameters like adiabatic compressibility (β), free length (L<sub>f</sub>), internal pressure (π<sub>i</sub>), apparent molar volume (φ<sub>V</sub>), apparent molar compressibility (φ<sub>K</sub>) and relative Association (R<sub>A</sub>) of the solution. Experimental results are analyzed based on molecular associations like hydrogen bonding and dipole-dipole interactions between the component molecules, which revealed that the variation of the parameters with the different molar concentrations of both ammonium dihydrogen phosphate and the acids. aqueous solutions Molecular Association Hydrogen Bonding Ultrasonic Study https://jsciences.ut.ac.ir/article_74797_a3ab77f5b23dab8484933371c39a6eac.pdf