Ultrasonic Study of Binary Mixtures of Insecticides in Hexane at Different Temperatures

Ultrasonic velocity, density and viscosity have been measured experimentally in solutions of fenvalerate and cypermethrin in the solvent hexane at four temperatures 30, 35, 40 and 50°C. Various acoustical and other related parameters like adiabatic compressibility, internal pressure, apparent molar compressibility and volume and solvation numbers have been computed and discussed in the light of molecular interactions-solute-solute and solute-solvent interactions in the solutions. In both the systems, solute-solvent interactions appear to be dominant.