In a Galvanic cell, how exactly does the salt bridge work? I've been told that it completes the circuit by allowing ions to flow between the half cells and balance out the charges as the system has to be electrically neutral for a voltage to exist.
1.) Why does it have to be electrically neutral for a voltage to exist?
2.) From my GCSE physics knowledge (I don't do A-level physics) current is the flow of electrons. If electrons are not flowing between the salt bridge, how is current maintained?
3.) Does the salt bridge not dry out after a while when ions are transferred to each half cell? Is it therefore replaced? Would ions from the solution in one half cell not transfer to the other by diffusion?
I would honestly appreciate any help with any of these questions as I've spent about 2 hours trying to figure it out myself with minimal success