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The purpose of the salt bridge is to maintain charge balance. As the electrons move from the anode to the cathode, electrons move from the cathode back to the anode to keep the flow of electrons constant. It ultimately maintains neutrality.
A salt bridge is important to allow anions to diffuse through. Without it, over time there will be an accumulation of electrons on the right side, so use anions like Cl- to diffuse to the other side to keep the two solutions neutral.
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