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