Question

In an electro-chemical cell, the purpose of the salt bridge is:

• A. to allow electron migration
  
• B. to allow neutron migration
• C. to allow ion migration
  
• D. to prevent ion migration
• E. none of these

Answer 1

The correct option is C to allow ion migration

The salt bridge allows ion migration and maintains electrical neutrality in two solutions. The salt bridge provides electrical contact between the two solutions and completes the electrical circuit. It prevents the mixing of electrode solutions.

Without the salt bridge, the solution in the anode compartment would become positively charged and the solution in the cathode compartment would become negatively charged. This will cause charge imbalance and the electrode reaction would quickly come to a halt.