Tuesday, March 1, 2011

DANIEL CELL

DANIEL CELL:

JOHN DANIEL
             * IT IS A PRIMARY CELL.

             *IT CANNOT SUPPLY STEADY CURRENT FOR A LONG TIME.

             *ANODE   -  COPPER VESSEL
               CATHODE  - ZINC ROD DIPPED IN Dil.H2SO4 IN A POROUS POT
               ELECTROLYTE  - CuSO4 (COPPER SULPHATE) SOLUTION IN  WHICH THE POT IS PLACED
               EMF - 1.08 V.

      *Zn + H2SO4 ----->  ZnSO4 + 2H + 2 electrons

             WHEN ZINC REACTS WITH Dil.H2SO4 ,Zn IONS AND TWO ELECTRONS ARE GIVEN OUT.

             *Zn IONS DIFFUSE THROUGH THE PORES OF THE POROUS POT AND REACTS WITH CuSO4 PRODUCING Cu IONS. 

             *Zn + CuSO4 -----> ZnSO4 + Cu

            *Cu IS DEPOSITED ON THE ANODE.

            *WHEN THE CELL IS CONNECTED BY A WIRE ,TWO ELECTRONS ON THE ZINC ROD PASS THROUGH THE EXTERNAL  CIRCUIT AND REACH COPPER VESSEL NEUTRALISING Cu.

            *THUS CURRENT FLOW FROM Cu TO Zn.

          
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