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Volumetric Flask Safety Precautions

by aticoindia

Volumetric Flask Safety Precautions

Volumetric Flask: one of the primary, crucial and most common laboratory glassware. It is used to prepare solutions. If we talk about its structure, then a volumetric flask is a kind of container with a long neck and flat bottomed bulb. It is specially designed to hold a certain amount of solution with proper safety. 

Usually, volumetric flasks are of transparent glass. But some are amber-coloured and are specially made for light-sensitive experiments. 

How to Use a Volumetric Flask?

  • Fill the flask with solvent (two-third part).
  • Add solute.
  • Pour enough solvent so that the solute gets dissolved completely.
  • More solvent should be added until it reaches the mark etched on the volumetric flask’s neck.
  • Using a pipette, which is a tool calibrated to transfer tiny volumes of liquids, continue adding solvent to the volumetric flask. If a pipette isn’t accessible, a dropper, which performs the same function as a pipette but is smaller in hand and transmits controlled amounts of liquid through drops, can be used instead.
  • Examine the meniscus of the solution, which is the curve seen at the solution’s upper surface. Surface tension causes this curvature, which can be either concave or convex. The endpoint should be determined by looking at the meniscus and the graduation line (the mark on the neck).
  • Use a stopper to close the open end of the volumetric flask.
  • To effectively mix the solution, invert the flask on a regular basis.

 

  • Before using the volumetric glassware, make sure it is properly clean. There must be no beading or droplet development on the inside walls of the vessel, and it must drain in such a way that a smooth film of solution sticks to the inside. If you see such drops, use a tiny amount of warm Alconox solution to clean the glassware. Use a brush if necessary. If Alconox treatments are ineffective, alternative techniques of glassware cleaning may be required. If you believe this is necessary, contact your lab instructor.

 

Lets Understand Safety Precautions Volumetric Flask 

Don’t Heat it Directly.

Never expose this laboratory glassware’s surface to direct heat because it can damage the flask. Also, don’t use the oven to dry it.

Clean the Flask before Using

Before using the volumetric laboratory glassware, make sure it is properly clean. There must be no beading or droplet development on the inside walls of the vessel, and it must drain in such a way that a smooth film of solution sticks to the inside.

If you see such drops, use a tiny amount of warm Alconox solution to clean the glassware. Use a brush if necessary. If Alconox treatments are ineffective, alternative techniques of glassware cleaning may be required. If you believe this is necessary, contact your lab instructor.

Don’t Hold the Neck with Force.

The most crucial point in the safe handling of a volumetric flask is not to hold this laboratory glassware firmly, especially from the neck. The neck of the volumetric flask is quite fragile and might break if you apply excessive force. 

 

The Final Word

That was all about the volumetric flask and the safety measures to be followed while working with this laboratory glassware. 

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