Volumetric flask

It is use to prepare the standard solution of fixed volume.

Don't carry out inputting solid (powder, pellet, etc.) directly to a volumetric flask and dissolving.  Dissolve solid in a beaker and then transfer the solution to the flask.

Keep in mind that it cannot prepare the fixed volume exactly if water drop sticks above the mark line.

After well stirring the inner solution, exactly add distilled water just to the mark line.