How does a salt bridge prevent charge buildup in a galvanic cell?

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A salt bridge in a galvanic cell prevents charge buildup by allowing ions to flow between the two half-cells, maintaining electrical neutrality. Without it, the charge difference created by electron flow would hinder further electron movement, as electrons would be removed from the positively charged side and added to the negatively charged side. This process is energetically unfavorable according to Coulomb's Law, which states that work must be done against the opposing forces. The salt bridge thus enables continuous electron flow and sustains the cell's operation. Overall, it is essential for the efficient functioning of galvanic cells.
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As electrons leave one half of a galvanic cell and flow to the other, a difference in charge is established. If no salt bridge were used, this charge difference would prevent further flow of electrons.

Why would the charge difference prevent further flow of electrons ??
 
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Because you'd be taking electrons away from the side that's already positively charged, and adding them to the side that's already negatively charged. By Coulomb's Law both of these are energetically unfavourable (i.e., to do them you have to do work against a force pushing the opposite way).
 
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