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The main purpose of a salt bridge is to maintain the electrical neutrality within the internal circuit. It also helps in preventing the reaction from attaining equilibrium.
A vital part of any voltaic or galvanic electrochemical cell is the salt bridge. Usually, it consists of a tube that is filled with electrolytic solutions like potassium chloride (KCl) or other chlorides. The salt bridge maintains the cell's electrical neutrality and permits free ion movement throughout the entire cell, preventing the accumulation of electrons that could impede processes in the half-cells.
The salt bridge is frequently an upside-down glass U-shaped tube filled with sodium chloride in empirical settings. In order to create an electrochemical cell, its two legs dip into two different electrolyte vessels (the half-cells).
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