What is the purpose of a Liebig condenser?

• A. To cool a gas
• B. To change steam to water
• C. To measure volume
• D. To remove impurities

Answer: (B)

A Liebig condenser is designed to turn hot vapour back into a liquid by removing heat. In use, the vapour from boiling liquid travels through the inner tube while cold water runs around it in the outer jacket. The heat is drawn away, so the vapour loses energy and becomes a liquid that can drip out into a receiver. That direct outcome—changing steam to liquid water—is why this option is the best choice. The other ideas aren’t what the condenser primarily does: it isn’t meant to measure volume or remove impurities, and while cooling is involved, the key function is condensation of vapour into liquid.