what is salt bridge?

explain its function?

Salt Bridge: A salt bridge is a U- shape containing concentrated solution of an inert electrolyte like KCl, KNO₃, K₂SO₄ etc.or a solidified solution of those electrolytes in agar-agar solution and gelatin.

These inert electrolytes do not take part in redox reaction of the cell and even dont react with the electrolyte used.

Function: the main functions of a salt bridge are;

• They allow the movement of ions from one solution to another without mixing of the two solutions and complete the electrical circuit.
• To maintain the electical neutrality of the solutions in the two half cells.