Chapter 20, Problem 32A

Interpretation Introduction

Interpretation:

The function of salt bridge in voltaic cell is to be explained.

Concept introduction:

A salt bridge is an inverted u tube filled with concentrated solution of inert electrolyte.

Answer to Problem 32A

The important function of salt bridge is:

1. Salt bridge completes the electrical circuit
2. Salt bridges maintains electrical neutrality of two half cell solutions

Explanation of Solution

The important function of salt bridge is:

1. Salt bridge completes the electrical circuit − the salt bridge connects the two solutions of the half cells and their electrodes are connected by a wire. So, salt bridge completes the circuit.
2. Salt bridges maintains electrical neutrality of two half cell solutions: the accumulation of charges in the two half cells is prevented by using salt bridge, which provides a passage for the flow of the charge in the internal circuit the salt bridge provides cations and anions to replace the ions lost or produced in the two half cells

Conclusion

The important function of salt bridge is:

1. Salt bridge completes the electrical circuit
2. Salt bridges maintains electrical neutrality of two half cell solutions