Question

Write down the functions of a salt bridge in an electrochemical cell.

Hint:

Common electrolytes used in salt bridges are KCl or KNO\(_3\) because their ions have similar mobilities.

Answer 1

Step 1: The salt bridge allows the migration of ions between the two half-cells to maintain electrical neutrality.
Step 2: It prevents accumulation of charges in the half-cells, which would otherwise stop the flow of electrons.
Step 3: The salt bridge completes the electrical circuit without allowing direct mixing of the solutions in the two half-cells.
Step 4: It minimizes liquid junction potential, ensuring a steady and accurate cell potential.