By Sunil Bhardwaj


Salt bridge is inverse U shaped glass tube which is filled with KCl and agar-agar. As the KCl salt is used that is why it is known as Salt Bridge. In some cases, KCl is replaced by \(KN{ O }_{ 3 }\) of \(N{ H }_{ 4 }N{ O }_{ 3 }\). The following are the functions of salt bridge:

1) It eliminates or minimizes the liquid-liquid junction potential i.e.\( { E }_{ j }\).

2) It helps in the migration of the ions from one side to other side i.e. from one single electrode to other electrode.

3) It connects the two electrolyte indirectly with each other.

4) It helps in closing the circuit.