Which flask is used for heating substances that need to be heated evenly; bulbous bottom allows heat to distribute through the liquid more evenly, mostly used in distillation experiments?

• A. Beaker
• B. Florence Flask
• C. Erlenmeyer Flask
• D. Bottle

Answer: (B)

Even heating of liquids relies on vessel shape. A Florence flask has a round bottom that distributes heat more evenly when placed on a burner or heating mantle, and its long neck helps prevent splashing while guiding vapors into a condenser during distillation. This design minimizes hot spots and allows the liquid to be swirled without spilling, producing steady, uniform heating—ideal for distillation experiments. Beakers heat unevenly because of their wide mouth and flat bottoms, while an Erlenmeyer flask, though good for swishing, has a conical shape that doesn’t promote as even heat distribution. A bottle isn’t suited for heating or distillation either. So the Florence flask is the best fit for this purpose.