salt bridge role

Question

Primary function of a salt bridge in a galvanic cell is to:

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1. **Problem**: As the reaction proceeds, positive ions build up at the anode (oxidation) and decrease at the cathode (reduction).
2. **Neutralization**: The salt bridge contains an inert electrolyte (like $KCl$ or $KNO_3$) in agar-agar.
3. **Ion Migration**: Anions from the salt bridge move to the anodic compartment, and cations move to the cathodic compartment.
4. **Circuit Completion**: This **maintains electrical neutrality** in both half-cells and completes the internal circuit, allowing current to flow continuously.
5. **Prevention**: It also prevents the two electrolyte solutions from mixing directly, which would cause a direct chemical reaction and no external current.

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salt bridge role

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