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Unformatted text preview: MAPUA I NST I TUTE OF TECHNOLOGY School of Chemical Engineering, Chemistry, Biological Engineering, and Material Science and Engineering Physical Chemistry Laboratory 2 - 3 rd Quarter SY 2010-2011 Neil Patrick P. Tangara , 3 rd Year B.S. Chemical Engineering Experiment No. 6 CHE M ICAL K I NET ICS: T HE HYDROLYSIS OF ME T HYL ACETATE Meynard Austria 1 , Neil Patrick Tangara, Darlene Pudolin, Emily Rose Santos, Aeiocellis Tan, Creza Loraine Talingting 2 1 Professor; 2 Students, all from CHM171L/A31, School of Chemical Engineering, Chemistry, Biological Engineering & Material Science and Engineering, Mapua Institute of Technology ABSTRACT This experiment intends to determine the order of reaction, rate law constant, and activation energy needed to initiate the reaction. Also, the effects of temperature, concentration, catalyst, and other parameters such as pressure on the rate of reaction have been investigated using chemical kinetics. The hydrolysis of Methyl Acetate was carried out with HCl as the catalyst. It was found to be a 2 nd order reaction with respect to the acid and had an activation energy value of 375,254.0016 J / mole. It was found that increasing both the temperature and the amount of catalyst present hasten the rate of reaction by an appreciable value by providing it more energy and an optimal reaction condition, respectively. Chemistry theories such as the kinetic molecular and collision theories have been taken into consideration upon interpretation of the results gathered. This report will discuss why such a phenomenon occurs. Keywords : rate law constant, order of reaction, activation energy, catalyst I N TRODUCT ION Chemical kinetics is the study and discussion of chemical reactions with respect to reaction rates, effect of various variables, re-arrangement of atoms, formation of intermediates etc. At the macroscopic level, we are interested in amounts reacted, formed, and the rates of their formation. At the molecular or microscopic level, the following considerations must also be made in the discusion of chemical reaction mechanism. Molecules or atoms of reactants must collide with each other in chemical reactions. The molecules must have sufficient energy (discussed in terms of activation energy) to initiate the reaction. Experiment 6 Group 5 March 1, 2011 │ │ 1 of 5 Ma In some cases, the orientation of the molecules during the collision must also be considered. Methyl acetate hydrolyzes to form acetic acid and methanol, according to the following reaction: ( 1) The reaction is extremely slow in pure water, but is catalyzed by both hydronium and hydroxide ions. In this experiment the kinetics of the reaction catalyzed by HCl will be studied. HCl also suppresses the ionization of acetic acid so as not to change the concentration of hydronium ions present.the concentration of hydronium ions present....
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