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Explain the redox reaction in galvanic cells. |
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Answer» Solution :Galvanic cell is a device in which electricity is produced using a SPONTANEOUS redox reaction . Any galvanic cell consist of two .single electrodes. which are also known as .half cells. or .redox couples.. Single electrode is a system in which reduced and oxidised species of the same substance remain in equilibrium. For example, Daniel cell contains the following electrodes, (i) A zinc ROD dipped in `ZnSO_4` solution It is represented as `Zn|Zn_(sq)^(2+)`. (ii) A copper rod dipped in `CuSO_4` solution. It is represented as `Cu|Cu^(2+)`. SINCE the tendency of Zn to lose electrons is greater than that of Cu, the reaction at the `Zn|Zn_(sq)^(2+)` electrode is as follows: `ZntoZn^(2+)+2e^(-)`(OXIDATION)  Reaction at the `Cu|Cu_(sq)^(2+)` electrode is as follows: `Cu^(2+) +2e^(-) to Cu` (reduction). The net cell reaction is `Zn+Cu^(2+)toZn^(2+)+Cu.` The electrons lost by zinc externally flow from zinc to copper. |
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