Experiment 12 Electrochemistry - Electrochemistry CHEM S126...

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Electrochemistry CHEM S126 Section No.: 33226 Kha Pham April 27, 2016 Date Performed: April 19, 2016 Partner: Jeremiah Jordan Instructor: Lin Zhu TA: Ibrahim Khan -
Introduction: Electrochemistry is one specific area of chemistry that is dealing with oxidation- reduction reactions. Electrical current is the flow of electric charge. Electrons flowing through a wire or ions flowing through a solution both generate electrical current. A reaction is a redox reaction when there are electrons transferred from one substance to another. Redox reactions have the potential to generate electrical current since they involve electron transfer. The cell potential of a reaction can be measured by using a voltmeter. The cell potential equals to the sum of the cell potential of the half reactions: E cell = E ox + E red (1) For the redox reaction that occurs spontaneously, the free energy change can be determined from the measured cell potential: ΔG = -nFE (2) The cell voltage of a cell measured at various temperatures can be used to determine th thermodynamic quantities ΔG, ΔH, or ΔS for overall cell reaction: ΔG = -ΔST + ΔH (3) In this experiment, the half-cell reduction potentials of various metal ions were determined; the effect of temperature on measured cell potential for the spontaneous redox

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