Voltaic Cell and Daniell Cell in simple way

VOLTAIC CELL

Voltaic cell is a simple cell.  It converts chemical energy to electrical energy. 

 At Anode :

1.    Zinc atoms donate electrons to produce zinc ions, Zn²⁺
2.    Zinc ions go into solution
3.    Half equation :  Zn(s) -------->  Zn²⁺ (aq)  +  2 e^-
   

        The electrons travel through the wire in the external circuit to the copper electrode

At Cathode :   

1.  the  electrons are taken by Cu²⁺ ions in copper(II)sulphate solution and change to copper metal.
2.  Copper metal is then deposited on the electrode.
3.   Half equation :  Cu ²⁺(aq) +  2 e^-   ---------->    Cu(s)                          
                        
   
   
   • Anode :  electrode where the process of donation of electrons takes place
   • Cathode  :  electrode where the process of acceptance of electrons takes place
   
   
    *     The more electropositive metal acts as the negative terminal while the less electropositive  metal acts as the positive terminal
   
   

   
   

   
   

   DANIELL CELL

      
       
                        

 

 At Anode :

1.    Zinc atoms donate electrons to produce zinc ions, Zn²⁺
2.    Zinc ions go into Zinc sulphate solution
3.    Half equation :  Zn(s) -------->  Zn²⁺ (aq)  +  2 e^-

        The electrons travel through the wire in the external circuit to the copper electrode

At Cathode :   

1.  the  electrons are taken by Cu²⁺ ions in copper(II)sulphate solution and change to copper metal.
2.  Copper metal is then deposited on the electrode.
3.   Half equation :  Cu ²⁺(aq) +  2 e^-   ---------->    Cu(s)                          

 

The overall chemical reaction :

                       Zn(s) + Cu²⁺ (aq)      ------------>   Zn²⁺(aq)  +  Cu(aq)


 

Daniell Cell can represented by the following equation

                         

                               Zn(s) / Zn²⁺(aq)  -------------->  Cu²⁺ (aq) /Cu(aq)

* http://www.docbrown.info/page07/addhoc07/cell7.gif