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A salt bridge in a galvanic cell maintains charge neutrality between the two half cells so that the cell can continue to function. It does this by containing inert ions that can flow to each of the half cells to balance out the built up charge caused by the transfer of electrons.
The anions and cations in the salt bridge dissolve in the solutions to maintain a charge balance so that the redox reaction can continue. The video on galvanic cells that Lavelle posted on his website actually really helped me understand this.
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