FUNCTION OF SALT BRIDGE:

A salt bridge, in chemistry, is a laboratory device used to connect the oxidation and reduction half cells of a galvanic cells (voltaic cell), a type of electrochemical cells. Salt bridges usually come in two types: glass tube and filter paper.

1. The salt bridge is a metallic stand that supports the cell.

2. The salt bridge is another name for the standard hydrogen electrode, thus it permits the other half-reaction potential to be measured.

3. The salt bridge contains a salt (positive and negative ions) which can migrate into the cell compartments to preserve electrical neutrality in each half-reaction compartment as the cell runs spontaneously.

4. The salt bridge contains the positive and negative cell electrodes, thus permitting the Ecell to be measured.

5. The salt bridge is a wire that permits electrons to flow between the cell compartments.
The purpose of the salt bridge is purely to complete the electrical circuit and allow the cell to function.