Abstract

Ultrasonic is an effective tool for studying the nature and strength of molecular interactions of binary mixtures. In this present work, molecular interactions of Ammonium dihydrogen orthophosphate (ADP)electrolyte were studied using Ultrasonic method. The sound velocity is one of those physical properties that helps in understanding the nature of liquid state. Ultrasound velocity, density and viscosity of ammonium dihydrogen orthophosphate electrolyte were measured at 303 K, 308 K, 313 K,318 K and 323 K. The data obtained during the study is used for determining the various acoustical parameters like acoustic impedance, adiabatic compressibility, Rao’s constant, Wada’s constant, molar and molal salvation number, molar and molal volume, molar and molal solvated volume. Thermodynamical parameters such as internal pressure, free volume and relaxation time are also calculated. Thermodynamic properties of liquid mixtures have been extensively used to study the departure of a real liquid mixture behavior from ideality. The ultrasonic study of liquids is of immense important in understanding the biological activity of drug molecules and the activation energy of the metabolic process basically depend on the type and strength of the intermolecular interactions. Ammonium dihydrogen phosphate (ADP), also known asmono ammonium phosphate (MAP),NH4H2PO4 is often used in the blending of dry agriculturalfertilizers, fire retardant for wood, paper, fabric, dispersant for fiber processing and dyeing industry, glaze for enamel, cooperating agent for fire retardant coating, decontamination agent for match stalk and candle core.

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