Salt Bridge Role
Easychemistry
Primary function of a salt bridge in a galvanic cell is to:
Select the correct option:
Solution
Incorrect! Answer:
Maintain electrical neutrality
- Problem: As the reaction proceeds, positive ions build up at the anode (oxidation) and decrease at the cathode (reduction).
- Neutralization: The salt bridge contains an inert electrolyte (like KCl or KNO3) in agar-agar.
- Ion Migration: Anions from the salt bridge move to the anodic compartment, and cations move to the cathodic compartment.
- Circuit Completion: This maintains electrical neutrality in both half-cells and completes the internal circuit, allowing current to flow continuously.
- Prevention: It also prevents the two electrolyte solutions from mixing directly, which would cause a direct chemical reaction and no external current.
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About This Question
- Subject
- chemistry
- Chapter
- electrochemistry
- Topic
- salt bridge role
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Maintain electrical neutrality
- Problem: As the reaction proceeds, positive ions build up at the anode (oxidation) and decrease at the cathode (reduction).
- Neutralization: The salt bridge contains an inert electrolyte (like KCl or KNO3) in agar-agar.
- Ion Migration: Anions from the salt bridge move to the anodic compartment, and cations move to the cathodic compartment.
- Circuit Completion: This maintains electrical neutrality in both half-cells and completes the internal circuit, allowing current to flow continuously.
- Prevention: It also prevents the two electrolyte solutions from mixing directly, which would cause a direct chemical reaction and no external current.
This easy difficulty chemistry question is from the chapter electrochemistry, covering the topic of salt bridge role. It appeared in the 2025 exam.
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