Volumetric Flasks

Volumetric glasses are measuring beakers that are designed to measure out a specified volume. The often are round bottomed, before tapering to a narrow neck, which is notched to indicate the desired volume level. Unlike measuring cylinders, they do not have any other measurements engraved except a specific volume, commonly 25cm³, so can be only be used for one volume. However, they are far ore accurate than measuring cylinders as they have narrow necks, so identifying and reading the meniscus (the lower curve in the top of a surface of liquid, where scientists measure volume from) is far easier. 

Uses

Most commonly in school, volumetric flasks are used in dilutions. They allow for scientists to take a small volume of a desired substances and dilute up their chosen volume. This is vastly useful in chemistry, as often the original concentration of a substances is far too strong for the required experiment. Volumetric flasks may also be use din titrations to measure a reagent as they are more accurate than a measuring cylinder, and it is imperative that the volumes are accurate in titrations.

How to Use

The video by teachinglearninguoit on youtube below shows how to use a volumetric flask

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