Question

In an experimental set-up for the measurement of potential of a half-cell using the reference electrode and a salt bridge, the salt bridge was suddenly removed.

1. What happens to the voltage when the salt bridge is removed?

2. Justify your answer.

3. Write any two examples of inert electrolytes used for the construction of salt bridge.

Answer 1

1. Voltage ceases.

2. When the salt bridge is removed the migration of ions between the half cells is hindered which results in the accumulation of charge near the electrodes. This decreases the cell voltage.

3. KCl, NH₄NO₃