100%(12)12 out of 12 people found this document helpful
This preview shows page 1 - 3 out of 5 pages.
ElectrochemistryCHEM S126 Section No.: 33226Kha PhamApril 27, 2016Date Performed: April 19, 2016Partner: Jeremiah JordanInstructor: Lin ZhuTA: 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:Ecell= Eox + Ered(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