Electrochemical or Galvanic cell

The Electrochemical cell or the Galvanic cell is the device in which a spontaneous redox reaction is used to convert the chemical energy into electrical energy which meanselectricity can be obtained with the help of oxidation and reduction reaction.

The Characteristics features of electrochemical cell :  Following are important characteristics of electrochemical cell,

(i) The Electrochemical cell consists of two vessels, two electrodes, two electrolytic solutions and a salt bridge.

         (ii) The two of the electrodes taken are made from different materials and usually set up in two separate vessels.

         (iii) The electrolytes which are taken in the two different vessels called as half - cells.

         (iv) The two vessels are linked by the salt bridge/porous pot.

(v) The electrode on which the oxidation takes place is known as the anode (or - ve pole) and the electrode on which reduction takes place is called the cathode (or + ve pole).

           (vi) In electrochemical cell, ions are only discharged on the cathode

           (vii) Similar to electrolytic cell, in electrochemical cell, from outside the electrolytes electrons flow from anode to cathode and current flow from cathode to anode.

   (viii) For the electrochemical cell, E_cell = +ve,  G = -ve.

   (ix) In the electrochemical cell, the cell reaction is exothermic.

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