Question

Saturated solution $K{NO}_3$ is used to make salt bridge because:

• A. Velocity of $K^{+}$ is greater than that of ${NO}_3^{-}$
• B. Velocity of ${NO}_3^{-}$ is greater than $K^{+}$
• C. Velocity of both $K^{+}$ and ${NO}_3^{-}$ are nearly same
• D. $K{NO}_3$ is soluble in water

Answer 1

The correct option is C Velocity of both $K^{+}$ and ${NO}_3^{-}$ are nearly same

Saturated solution $KN{O}_3$ is used to make the salt bridge because the velocity of both $K^{+}$ and $N{O}_3^{-}$ are nearly the same. A salt bridge helps in maintaining electrical neutrality in both electrode solutions by a flow of ions.

The salt bridge also provides electrical contact between the two solutions and completes the electrical circuit.

Hence, option $\text{C}$ is correct.