How to Pour from an Erlenmeyer Flask

Erlenmeyer flasks are extremely useful in the laboratory.

An Erlenmeyer flask is a piece of glassware used by chemists and other scientists for a variety of reasons. With its wide bottom and narrow neck, the Erlenmeyer flask is useful for mixing and storing solutions. The narrow neck allows for a stopper to be used to contain the solution. When the time comes to pour out the solution, a few simple steps should be followed to minimize loss of material.

Things You'll Need

• Erlenmeyer flask with solution
• Funnel
• Beaker or other container
• Ring stand
• Clamp
• Safety gear

Instructions

1. When working in the laboratory, the importance of wearing personal protective equipment is in direct proportion to the health hazards inherent in the materials you are handling. Eye protection, aprons and gloves are standard and should always be worn. Certain materials may require personal respirators or the use of a fume hood as well, among other precautions.

2. Depending on the glassware to be used, choose the type of clamp that will hold it securely. Loosen the bolt on the clamp and slide it onto the pole of the ring stand. Secure the clamp to the ring stand by tightening the bolt again. Make sure that both the clamp and ring stand are secure and stable.

3. Squeeze the spring clamp to open it and slide the empty glassware into it. Check for a secure grip. Ensure that the glassware sits flat. In the case of a test tube, be sure it is held steadily, securely and is positioned at a slight angle pointing away from any people.

4. Place a funnel into the empty glassware. Using a funnel will direct the liquid from the Erlenmeyer flask into the new container and help to avoid any spills.

5. If there is a rubber stopper, remove it from the Erlenmeyer flask. Carefully place the opening of the flask above the funnel, and slowly begin the transfer of liquid by tilting the Erlenmeyer flask until a steady stream of liquid flows from it. Continue pouring until the desired amount has been transferred.

Tips & Warnings

• Always know the identity of the materials you are handling. It is a good idea to consult the Material Safety Data Sheet for each chemical to determine health and safety hazards prior to handling any material.

• When handling acids, be sure to always add acid to water, and to do it slowly. Formation of hydrogen gas during the mixing of acids and water can cause an explosion.

References

• Prentice Hall Chemistry; Antony Wilbraham et al.; 2005
• Fairborn Chemistry Student Manual: Laboratory Techniques
• University of Wisconsin: Science Lab Techniques