In a galvanic cell reaction between Mg and Al, a salt bridge is used to maintain electrical neutrality. The salt bridge consists of an aqueous solution of a salt that is compatible with the reactants and products of the cell. This salt bridge helps to balance the charges in the two half-cells of the galvanic cell, allowing the flow of electrons and maintaining the flow of ions to ensure the cell functions properly. Common salts used in salt bridges include potassium chloride (KCl) and sodium chloride (NaCl).
