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Dr. Lavelle discussed that a salt bridge or porous disk must be added to reaction beakers to remain neutral. What is the purpose of that?
As electrons are transferred from the anode to the cathode, there is a salt that builds up which would create a charge gradient. In order to maintain a neutral solution, there needs to be a salt bridge that balances the charges.
If a solution becomes too negatively charged, it will repel electrons so the addition of a salt bridge or a porous disk is to allow flow of electrons back to the reducing agent so that the solutions remain neutral and can continue to transfer electrons. It essentially makes the flow of electrons into a loop so that the solutions remain neutral.
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