Rinsing a Volumetric Flask
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Select a volumetric flask of appropriate size.
Before using a flask, it is generally a good idea to rinse it with the solvent that will be used to make your solution. Add several milliliters of solvent to the flask and replace the stopper. Rotate the flask to insure rinsing of all sides. Dispose of the solvent in a waste container.
Repeat the rinsing process at least one more time.