Question

Saturated solution of KNO₃ is used to make salt bridge because:

Options

• velocity of K⁺ is greater than that of \[\ce{NO^-_3}\].

• velocity of \[\ce{NO^-_3}\] is greater than that of K⁺.

• velocities of both K⁺ and \[\ce{NO^-_3}\] are nearly the same.

• KNO₃ is highly soluble in water.

Answer 1

Velocities of both K⁺ and \[\ce{NO^-_3}\] are nearly the same.

Explanation:

A saturated solution of KNO₃ is used in salt bridges because K⁺ and \[\ce{NO^-_3}\] ions have nearly equal ionic mobilities, which prevents the development of liquid junction potential and maintains electrical neutrality in the cell.