Class A flasks are manufactured to high standards of precision for critical analytical work often with a unique serial number for traceabilitywhereas Class B flasks offer less accuracy and are therefore more suitable for less demanding applications such as qualitative or educational use.
Volumetric flasks are used for precise dilutions and preparation of standard solutions. These flasks are usually pear-shaped, with a flat bottom, and made of glass or plastic. The flask's mouth is either furnished with a plastic snap/screw cap or fitted with a joint to accommodate a PTFE or glass stopper.
A volumetric flask is a piece of laboratory glassware that is used to prepare and measure chemical solutions. It is used to make up a solution to a known volume. Volumetric flasks measure volumes much more precisely than beakers and Erlenmeyer flasks. How to Recognize a Volumetric Flask A volumetric flask is characterized by a bulb and a long neck.
Volumetric flasks for precise measurement in solution preparation and dilution are available at VWR. Select models of borosilicate glass, nalgene, or other plastics that conform to Class A or Class B requirements. Amber and low actinic stained glass construction are available for light-senstive preparations.
How to Use a Volumetric Flask. To prepare a solution in a volumetric flask, follow these steps: Measure and add the solute for the solution. Add enough solvent to dissolve the solute. Continue to add solvent until you near the line marked on the volumetric flask. Use a pipette or dropper to fill the volumetric flask, using the meniscus of the.
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