Vol. 3, Issue 4 (2019)
Kinetics and solvent effect on activation parameter of aquo-propanol solvent system for acid catalyzed solvolysis of propyl formate
Author(s): AK Singh
Abstract: Kinetic study of acid catalyzed hydrolysis of propyl formate has been carried out volumetrically in water-propanol binary solvent system having different concentration of the organic component from 30 to 70% (v/v) of propanol-2 at different temperature ranging from 20 to 400C. Specific rate constant values calculated by first order were found to be decreasing with increasing proportion of propanol at all temperatures. Enhancement in iso-composition activation energy(EC) with increasing concentration of propanol-2 and depletion of dielectric activation energy(ED) with depletion of dielectric constant of reaction media inferred that initial state is solvated and Transition state is desolvated. The thermodynamic parameters like Enthalpy of activation (DH*), Entropy of activation (DS*) and Free energy of activation (DG*) were evaluated with help of Wynne-Jones and Eyring equation and its none linear plots with mole% of propanol is indicative of specific solvation taking place in reaction media. The isokinetic temperature was calculated by linear plots of DH* verses DS* and its value turned out to be more than 300(621.29K/Mole2), it shows that there is strong interaction that takes place between solvent and solute molecule.