EXP6-chm171L - CHM171L / A11 Physical Chemistry Laboratory...

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CHM171L / A11 Physical Chemistry Laboratory 2 3 rd Quarter S.Y. 2010-2011 Chemical Kinetics: The Hydrolysis of Methyl Acetate Austria, Maynard 1 , Co, Argenia B. 2 1 Professor, CHM171L/A31, School of Chemical Engineering, Chemistry and Biotechnology, Mapua Institute of Technology; 2 Student, CHM171L /A31 , School of Chemical Engineering, Chemistry and Biotechnology, Mapua Institute of Technology ABSTRACT Experiment 6 covered facts on chemical kinetics, which highlighted the hydrolysis of methyl acetate. This experiment aimed to help the students understand the different factors affecting these rates in such a way that they can contemplate with the theories behind all phenomena involved. Hydrolysis corresponds to the reaction with water. It is a chemical process in which a molecule is cleaved into two parts by the addition of a molecule of water. HCl, water, and methyl acetate were equilibrated in an electronic water bath under 35 °C temperature. Several aliquots from the mixture of these three reagents which were pre- cooled to slow down the reaction time sufficiently were titrated with a base sodium hydroxide. The experiment is subdivided into three parts in order for the students to observe the effect of temperature, as well as the concentration in the rate of reaction. At the end of the experiment, increasing the concentration of the reactants will increase the frequency of collisions between the two reactants. This is because the molecules in the reaction mixture have a range of energy levels. When collisions occur, they do not always result in a reaction. If the two colliding molecules have sufficient energy they will react. Moreover, by heating the mixture, the energy levels of the molecules involved in the reaction are raised. Therefore, increasing temperature means the molecules move faster. Rate constants, and hence reaction rates, are often found to depend strongly on temperature. It is therefore important to quote the temperature at which any rate constant is determined. An increase in catalyst mass leads to a slight increase in reaction rate. It can be seen that the assumption of a linear dependence of the rate on the mass of the catalyst is valid. INTRODUCTION 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. There are many topics to be discussed, and each of these topics is a tool for the study of chemical reactions. By the way, the study of motion is called kinetics, from greek kenesis meaning movement. Kinetics is the study of the rates of chemical processes in an effort to understand what it is that influences these rates and to develop theories which can be used to predict them. Knowledge of reaction rates has many practical applications, for example in designing an industrial process, in understanding the complex dynamics of the atmosphere and in understanding the intricate interplay of the chemical reactions that are the basis of life. At a more fundamental level we want
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This note was uploaded on 07/31/2011 for the course CHE-CHM-BT CHM171L taught by Professor Calderon during the Spring '11 term at Mapúa Institute of Technology.

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EXP6-chm171L - CHM171L / A11 Physical Chemistry Laboratory...

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