International Journal of Science, Engineering and TechnologyAuthors: Dr. Kumari Priyanka
Abstract: The solvent effect of ethanol (dipolar protic solvent) on the acid catalysed solvolysis of Propyl methanoate was studied by carrying out the hydrolysis of the ester in water-ethanol (EtOH) media of varying composition consisting of 20% to 80%(v/v) at different temperatures ranging from 20 to 40°C. The specific rate constant values of the reaction were found to decrease with increasing concentration of ethanol in the reaction media li was found that with increase in temperature of the reaction from 20 to 40°C from 0.252 to 1.258 molecules of water are associated with the activated complex and from this, it is inferred that mechanistic path followed by the reaction in presence of ethanol is changes from bimolecular to unimolecular The depletion and enhancement observed respectively in iso-composition and iso-dielectric activation energies reveal that the transition state is solvated and initial state is desolvated with addition of ethanol (EIOH) in reaction media. Almost unity value of slope of the plots of log k values against log [H+] values shows that the reaction follows AAC2 mechanism. From the values of iso-kinetic temperature, which comes to be 280, it may be concluded that in water-EtOH reaction media, the reaction follows Barclay-Butler rule and there is weak but acceptable interaction between solvent and solute in the reaction media.
DOI: http://doi.org/10.5281/zenodo.18631308
