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So [censored] electrons flow from the anode to the cathode, essentially leaves a more positive charge on the left side (anode) compared to the cathode. The salt bridge neutralizes that charge by allowing electrons to migrate back to the left via a sort of concentration gradient where solutes will always move from high to low concentration without the input of any energy.
Clarice Chui 2C wrote:What is the purpose of a salt bridge?
With the flow of electrons from the anode to the cathode, there is a charge buildup in each flask. To neutralize this excessive positive and negative charge, the salt cations and anions from the salt bridge neutralize the charge.