SALT BRIDGE

"An ionically conducting path between separate compartments of an electrochemical cell. Often the working and reference (and occasionally even the counter) electrodes are in completely separate compartments and the required conducting path between them is provided by a tubing filled with highly conducting electrolyte solution. A common arrangement for a ""salt bridge"" is an inverted ""U"" shaped glass tubing with its ends dipped into the solutions of the two cell compartments; however, other materials and shapes are also used. The salt bridge may contain any conducting solution, but very often a highly concentrated potassium chloride solution (often immobilized by some gelling agent) is used. "