Kinetic studies are carried out by measuring Ultrasonic velocities in the mixing of bases like aniline, acids like phenol with esters like ethyl acetate and with octanol as hydroxyl solvent. The ultrasonic velocities are measured using ultrasonic pulse echo system on mixing of different solvents at various concentrations and at different temperatures. The results show increase in the basic content in the binary mixture increases the ultrasonic velocity, whereas increase in acid content decreases the ultrasonic velocities. Kinetically the mixing process is first order in the reactive component, acid or base. Another important feature is effect of solvents like octonol instead of ethyl acetate. The reaction rate is larger with octonol compared to ethyl acetate. Arrhenius Parameters were computed for Phenol-ethyl acetate and energy of activation , enthalpy of activation . Free energy of activation and entropy of activation are the right order of magnitude for these kinetic processes.
