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In a Galvanic cell, electrons flow form the anode to the cathode which results in solutions holding charges. The anode will become positive as it loses electrons, and the cathode solution will becomes more negative as it gains electrons. The salt bridge is put in place to neutralize the solutions. The negative ions from the salt (NO3-, if the salt is NaNO3 for example) will flow towards the anode to balance the positive charge forming, and the positive ion from the salt (Na+ for example) will flow towards the cathode to balance the negatively charged solution.
The purpose of a salt bridge is to maintain charge balance because the electrons are moving from one half cell to the other. Without a salt bridge, the solution in the anode compartment would become positively charged and the solution in the cathode part would become negatively charged. This would create a charge imbalance that would cause the reaction to stop.
A sat bridge is usually comprised by a strong electrolyte which is further made up of ions. This salt bridge allows for the neutralization and flow of electrons between a cathode and anode solution. Without a proper salt bridge, the cathode solution will become negatively charged while the anode solution would become positively charged.
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