Plastic Erlenmeyer flask Polypropylene – A Plastic Erlenmeyer flask, also known as a conical flask or a titration flask, is a type of laboratory flask which features a flat bottom, a conical body, and a cylindrical neck.
Erlenmeyer flasks have wide bases, with sides that taper upward to a short vertical neck.
They may be graduated, and often spots of ground glass or enamel are used where they can be labelled with a pencil. It differs from the beaker in its tapered body and narrow neck. Depending on the application, they may be constructed from glass or plastic in a wide range of volumes.
The mouth of the Erlenmeyer flask may have a beaded lip that can be stopped or covered. Alternatively, the neck may be fitted with ground glass or other connector for use with more specialized stoppers or attachment to other apparatus.
Uses in Chemistry
- The slanted sides and narrow neck of this flask allow the contents of the flask to be mixed by swirling, without risk of spillage, making them suitable for titrations by placing it under the burette and adding solvent and the indicator in Erlenmeyer flask. Such features similarly make the flask suitable for boiling liquids. Hot vapor condenses on the upper section of the Erlenmeyer flask, reducing solvent loss.
- Erlenmeyer flasks’ narrow necks can also support filter funnels.
- Erlenmeyer flasks are especially appropriate for recrystallization process. The sample to be purified is heated to a boil, and sufficient solvent is added for complete dissolution. The receiving flask is filled with a small amount of solvent, and heated to a boil. The hot solution is filtered through a fluted filter paper into the receiving flask. Hot vapours from the boiling solvent keep the filter funnel warm, avoiding the premature crystallization.
Uses in Microbiology
- Erlenmeyer flasks are also used in microbiology for the preparation of microbial cultures. Erlenmeyer flasks used in cell culture are sterilized and may feature vented closures to enhance gas exchange during incubation and shaking.
- The use of minimal liquid volumes, typically no more than one fifth of the total flask volume, and baffles moulded into the flask’s internal surface both serve to maximize gas transfer and promote chaotic mixing when the flasks are orbitally shaken. The oxygen transfer rate in Erlenmeyer flasks depends on the agitation speed, the liquid volume, and the shake-flask design. The shaking frequency has the most significant impact on oxygen transfer.
