Question

A saturated solution of $KN{O}_3$ is used to make a salt bridge because

• A. the velocity of $K^{+}$ is greater than that of $N{O}_3^{-}$
• B. the velocity of $K^{+}$ is lesser than that of $N{O}_3^{-}$
• C. the velocity of $K^{+}$ and $N{O}_3^{-}$ are nearly the same
• D. $KN{O}_3$ is highly soluble in water

Answer 1

The correct option is C the velocity of $K^{+}$ and $N{O}_3^{-}$ are nearly the same

The purpose of a salt bridge is to complete the circuit and maintain electrical neutrality in both the solutions. If there is a significant difference in the migration velocity of the ions in a salt bridge there will be a charge build up in the solution of the two half cells, which is also known as the junction potential and it will reduce the efficiency of the cell.