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LOL. The salt bridge provides no other purpose than to allow the free flow of ions from each side of the cell to prevent the polarization of one side that would stop the reaction from occurring. It's not made of salt so it doesn't change the concentration of either solution.
The salt bridge essentially helps to prevent charge accumulation on either side (which would nullify the battery system). Since it is made out of tubing with gel, it will not chemically interact with the cell. It allows the charges to move, and to keep the cell going.
The salt bridge isn't actually made out of salt. It is a tube with ions inside to prevent the charge build-up during the redox reaction. I believe that without a salt bridge, a positive charge would build up on the anode side and a negative charge on the cathode side which would preventing the reaction from occurring.
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