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Exp1-chm171L - CHM171L A11 Physical Chemistry Laboratory 2...

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CHM171L / A11 Physical Chemistry Laboratory 2 3 rd Quarter S.Y. 2010-2011 ELECTROCHEMISTRY: Determination of Faraday’s Constant 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 Electrochemistry aims to determine the effect of current on electrolytic reactions at a given time, to determine the Faraday’s constant, and to familiarize the students with the electrolytic analyzer equipment. Copper Sulfate solution was the reagent used on this experiment and concentrated Nitric Acid was the one used to clean the electrodes after the experiment. There are two electrodes which were subjected to different currents. Hence, with varied masses from initial weight of Pt to final weight, the weight of copper has been determined. Since, the reaction of copper ions will consist of 2 electrons, this will be used to calculate for the faraday’s constant, which has an actual value of 96,450 coulombs. Furthermore, the experiment will hold on test whether the testing will yield to acceptable values. Moreover, the amount of any substance dissolved or deposited in electrolysis is proportional to the total electric charge passed. The amounts of different substances dissolved or deposited by the passage of the same electric charge are proportional to their equivalent weights. INTRODUCTION Electrochemistry is the study of interchange of chemical and electrical energy. Chemical reactions that involve a change in the oxidation state of chemical species are called redox reactions (an abbreviation of reduction-oxidation reaction). Redox reactions can be identified, and the movement of electrons can be followed, by using a type of formal "bookkeeping" of the number of electrons associated with atoms. This accounting of electrons involves assigning oxidation numbers to individual atoms within a chemical species. Redox reactions are reactions in which there are changes in oxidation numbers. Every redox reaction can be divided into two half-reactions: one that involves a gain of electrons and one that involves a loss of electrons. The gain of electrons is called reduction and the loss of electrons is called oxidation. We are interested in separating the chemical species such that the electrons transfer via an external circuit. That way, we can measure the electrochemical effects. To properly understand the connection between the redox reaction and the electricity, the overall redox reaction should be balanced using a half-reaction method. Set up the physical reaction vessel such that the chemicals from one half reaction are separated from those of the second half reaction. For reaction to occur, it still needs to connect the solutions to complete the circuit. This is done by attaching wires between electrodes in the two half cells and by connecting the solutions of the two half
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