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Each beaker has a solution of respective ions for each electrode metal. So in a beaker with a zinc electrode, the solution it is in will contain Zn2+ ions. If it is a copper electrode, the solution contains copper ions. Of course you can't usually get pure metal ions on their own; they had to have come from some original compound. Because of this, there will be some anions in each solution, but they aren't really important and don't have a significant impact on the reaction.
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