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Rupali Wadhwani from SAGAR PUBLIC SCHOOL, asked a question
Subject: Chemistry , asked on 12/2/12

 what are the functions of salt bridge in an electrochemical cell??

EXPERT ANSWER

Anand Singh , Meritnation Expert added an answer, on 13/2/12
420 helpful votes in Chemistry

Salt bridge is a U- tube containing electrolyte like KCl, KNO3 etc in semi- solid agar. It connects two half cells.  The main uses of salt bridge are: 

  •  Salt bridge maintains the electrical neutrality of each half cell 

The transfer of electrons from Zn anode to Cu cathode develops excess +ve ions in ZnSO4 solution due to Zn2+ ions and excess -ve ions in CuSO4 solution due to SO42- ions which are neutralized by Cl- and K+ of salt bridge. 

  •  Salt bridge maintains the flow of current by completing the circuit 

The circuit is completed externally by conducting wire for flow of current and internally by salt bridge for flow of ions.

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