hi friends  this is

 

 

  1.. A single vertical line ( | ) represents a phase boundary between the metal ion and its electrode..

 

  Zn|Zn²⁺

 

 

2..   It should be noted that  electrode should be written on the left of the metal ion in anode half cell  while it should be written on the right of the metal ion in cathode half cell.

 

eg.  Zn |Zn²⁺                                       Cu²⁺ | Cu 

 

3..  A  double vertical line ( || ) represents the salt bridge which allows ions to flow through but it prevent the electrolyte from mixing..

 

4..  The anode half cell should be written on the leftside and cathode half cell  should be written on the right side  in a complete cell diagram.

 

5.. In a complete cell digm, a salt bridge seperates the anode halfcell and cathode halfcell.

 

eg..   Zn | Zn²⁺                 ||            Cu²⁺ | Cu

 

6.. The inert electrode should be enclosed within the brackets.

eg.. 

            Mg | Mg²⁺          ||     H²⁺ | H₂  (Pt)

 

7.. The emf   involved in   the  reaction should be written on right hand side of the  cell reaction..

 

eg..

 

    Zn |  Zn²⁺           ||          Cu²⁺ | Cu               E= 1.6 eV 

 

8.. If the emf value is negative then the cell reaction is not feasibel in the given direction.. but it takes place in the opposite direction.

 

9.. A  reversible cell is  one which changes its direction of the cell reaction  if the current is reversed.

 

if u find any mistake pls  notify me.

 

thank u