Question

In a galvanic cell, the salt bridge

• A. Does not participate chemically in the cell reaction
• B. Stops the diffusion of ions from one electrode to another
• C. Minimize the liquid junction potential
• D. Ensures mixing of the two electrolytic solution

Answer 1

Answer: (A), (C)

Minimize the liquid junction potential

In a galvanic cell, the salt bridge does not participate chemically in the cell reaction. The ions of the electrolyte present in the salt bridge neither react with the ions of the electrode solutions, neither get oxidized nor get reduced at the electrodes.
The salt bridge provides electrical contact between the two solutions and thereby completes the electrical circuit.

When two electrolytic solutions of different compositions comes into contact, due to the difference in the activities of the ions present in the solution, a potential develops between them, known as liquid junction potential. A salt bridge is always used to minimize the liquid junction potential by maintaining the electrical neutrality in the solutions by the flow of ions.

It does not ensure the mixing of electrolytes of solution.