ACTIVATION PARAMETER AND SOLVENT EFFECT ON SOLVOLYSIS OF ETHYL BENZOATE IN AQUO-ORGANIC SOLVENT SYSTEM
A. K. SINGH *
Department of Chemistry (CCSIT), Teerthanker Mahaveer University, Moradabad, India.
*Author to whom correspondence should be addressed.
The rate of solvolysis of ethyl benzoate was estimated volumetrically over the temperature range of 20°c to 400c. in water-methanol mixture at different composition. The depletion and enhancement in value of iso-composition activation energy and iso- dielectric activation shows solvation in transition state and de-solvation in initial state respectively. The effect of solvent on reaction rate was tested in term of activation parameter. Simultaneous decrease in values of DH* and DS* with increase in value of DG* with solvent composition show that the reaction is Enthalpy domination and Entropy controlled .There is weak interaction between solvent and solute because the values of iso-kinetic temperature is less than 300 K/Mole2.
Keywords: Ethyl benzoate, water-methanol activation parameter, solvent effect, solvent-solute interaction, Iso-kinetic temperature, specific and non specific salvation, solvation in initial and transition state, Barclay-Butler rule