Which flask has a bulbous bottom and is ideal for even heating, commonly used in distillation?

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

Answer: (A)

A flask with a bulbous bottom heats more evenly because the round surface distributes heat across the entire bottom, reducing hot spots and allowing the liquid to boil more uniformly—an important feature for controlled distillation. The narrow neck also helps minimize splashing and provides a convenient point to attach a condenser or other apparatus, making it well-suited for distillation setups. This is why a Florence flask, which has a round bottom and long narrow neck, is ideal. The other shapes serve different purposes: the conical Erlenmeyer is great for mixing but doesn’t heat as evenly as a round bottom; the beaker is flat-bottomed and meant for general stirring and pouring rather than controlled heating; a bottle lacks the specialized neck and compatibility needed for distillation equipment.