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Not absolute
- Even Class A volumetric glassware is not absolute but rather has a tolerance from its stated nominal value.
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Jun 17, 2023 · Some glassware such as volumetric flasks and volumetric pipets only have a single line to indicate volume. They are made to measure just one specific volume. In the case of the glassware used in general chemistry lab, both the 10 mL volumetric pipet and 50 mL volumetric flask will have two significant figures (sig figs) after the decimal point ...
May 20, 2019 · Volumetric glassware should not be emptied by holding onto the neck alone. The bottom of the flask should always be supported to prevent glassware breakage and possible injury.
Jun 12, 2008 · Volumetric glassware, such as pipettes, burettes, and flasks, is required when performing any analytical determinations. This page provides a table of typical uncertainty values for the calibrated volume of such glassware.
ItemVolume (ml)Uncertainty (ml)Burette50.00±0.02Transfer pipette “To Deliver”50.00±0.05Transfer pipette “To Deliver”30.00±0.04Transfer pipette “To Deliver”25.00±0.03Oct 25, 2024 · Class A vs Class B Glassware. The table below shows the difference between the Lab Glassware: Class A vs Class B. Extremely precise, with very low tolerances. Less precise than Class A, with higher tolerances. Highly accurate for measurements. Moderately accurate for measurements.
Jul 25, 2023 · The volumetric measurements indicated on Class A glassware are more accurate and reliable. It is typically more expensive than Class B glassware due to the higher precision and quality. Class A glassware has the highest level of accuracy out of all the different types of glassware.
Volumetric glassware (laboratory glassware that is carefully calibrated for delivering precise volumes) is available in Class A and Class B. The allowed tolerances (or errors) for Class B are typically twice those for Class A. These are some typical tolerance values for Class A glassware. Pipette. Capacity.
