A salt bridge is a component used in electrochemical cells that allows the flow of ions between the two half-cells while preventing the mixing of the different solutions. It typically consists of a gel or a tube filled with a salt solution, such as potassium nitrate, which maintains electrical neutrality by allowing positive ions to migrate to the cathode and negative ions to the anode. This helps sustain the flow of electric current by completing the circuit within the electrochemical cell.
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