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MODULE I -ELECTROCHEMISTRY Introduction Electrochemistry is the branch of chemistry which deals with the relation between chemical energy and electrical energy.It includes two types of cells. They are:- 1. Electrolytic cell- it is used to convert electrical energy in to chemical energy. 2. Electrochemical cell- it is used to convert chemical energy in to electrical energy.it is also called galvanic cell or voltaic cell. Differences between electrolytic and electrochemical cells Electrolytic cell Conversion of electrical energy into chemical energy The anode is positive plate and cathode is negative plate Electrons are supplied to the cell from the external power supply Not a spontaneous reaction Eg: Electroplating Electrochemical cells Chemical energy into electrical energy The anode is negative plate and cathode is positive plate Electrons are drawn from the cell. Spontaneous reaction. Eg: Corrosion The extent of chemical reaction occurring at the electrode is governed by Faraday’s law of electrolysis. The e.m.f of the cell depends on the concentration of the electrolyte and chemical nature of the electrode (Nernst Equation) Daniel cell:It consist of Zn electrode immersed in ZnSO4 solution in abeaker and a Cu electrode immersed in CuSO4 solution in abeaker and they are connected by means of salt bridge.The cell is represented as, Zn/Zn2+// Cu2+/CuPDF Image | MODULE I ELECTROCHEMISTRY
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