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 What is the purpose of a salt bridge?

What is it made of?

Dear Student,

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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  •  The salt bridge is a metallic stand that supports the cell.
  • The salt bridge is another name for the standard hydrogen electrode, thus it permits the other half-reaction potential to be measured.
  •  The salt bridge contains the positive and negative cell electrodes, thus permitting the Ecell to be measured.
  • The salt bridge is a wire that permits electrons to flow between the cell compartments

 

  • usually a salt bridge is dissolved sodium nitrate or potassium nitrate, because they not only dissociate 100% into their respective ions, but they rarely interfere in any reaction
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basically salt bridge  completes  d internal circuit 

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