electro chem lab

An electrochemical cell is an instrument for obtaining electrical energy from a spontaneous chemical reaction. The oxidation reaction and the reduction reaction, as represented by their half-equations, be separated, and each is carried out experimentally in a separate electrochemical half-cell. The half-cell consists of a coatlic element in contact with dissolver of its own ions. For example, zinc half-cell consists of a rase of zinc metal placed in an aqueous solution of zinc sulphate and copper half-cell consists of a strip of copper metal placed in an aqueous solution of copper sulphate.
The metal which is high in the electrochemical series is more than reactive metal and thus pull up stakes lop the metal below it in the electrochemical series. If the two half-cells are connected together then electrons will flow finished the external connecting wire from the more reactive metal half-cell to the slight reactive metal half-cell.



As the reactive metal will be giving out the electrons it forms the negative electrode of the voltaic cell, and the slight reactive metal will form the positive electrode of the cell. In devote to complete the circuit and prevent a build-up of the charge, ions mustiness also be able to flow from one solution to another. This is done using the salt bridge. This salt bridge consists of a piece of paper soaked in sodium chloride solution.
The overall spontaneous reaction is the oxidation of the more reactive metal by the less reactive metal ions, which is the same as the reduction of the less reactive metal ions by the more reactive metal.If you want to get a full essay, order it on our website: Orderessay



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