Preparing a dilution


Water is not always the best solvent for preparing a solution! Be sure to choose the right solvent!
Transcript : French English
Side note: this video was made to emphasize the important practical aspects, while at the same time keeping it humorous.

Introducing a solution with a graduated pipette


The volume introduced must correspond to the nominal volume of the pipette
illustration of a pipette in a flask. the pipette does not touch the wall of the flask.


No contact between the pipette and the side of the flask.
No capillary action for the last drops
The poured volume is not correct
illustration of a pipette in a slanted vial. the tip of the pipette makes contact with the wall of the vial.


Contact between the pipette and the side of the flask.
Suction of the last drops by capillary action
The poured volume is correct
Never withdraw the stock solution directly (solution of known concentration or commercial solution) from its container. It is imperative to use an intermediate container.

Preparing a solution

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