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I do not get how these work. I understand that in a battery, electrons flow from one side to the other, and that the salt bridge allows this to happen by preventing a buildup of charge on one side. Does this mean the cations in the salt bridge actually flow out of the bridge and into the half-cell that is losing electrons?
If this is true, wouldn't this mean that the salt bridge would eventually run out if there were an unlimited supply of oxidizable/reduceable substrates?
If this is true, wouldn't this mean that the salt bridge would eventually run out if there were an unlimited supply of oxidizable/reduceable substrates?