Volumetric flask

Volumetric flask (sometimes volumetric flask ) are volumetric instruments, which are provided for accurate measurement of certain quantities of liquid. They are mainly used for the preparation and storage of standard solutions with exact concentrations.

Volumetric flasks have no scaling, but have a single ring mark, which is quite drawn around the neck to avoid reading errors. Accordingly, always a given amount of a solution must be applied.

Through the narrow neck results in a high setting for the solvent volume. Volumetric flask therefore includes pipettes and burettes for the analysis with the most accurate volume measuring devices in the laboratory.

Volumetric flasks are calibrated to the inlet (or contain); that is, the amount of liquid absorbed corresponds to the printed volume indication. If you fill the liquid into another vessel, as the volume of liquid it is lower because a small portion of the liquid remains in the flask.

The setting is correct when the lower meniscus of the liquid touches the ring mark, just as with burettes usual.

The heating of flask may lead to loss of measurement accuracy.

Are the customary commercial volumetric flask of 5 milliliters to 10 liters. They usually consist of borosilicate glass, polypropylene, or polymethyl pentene, but only glass devices can be calibrated.