RDGvolflaskpipet - Reading Volumetric Flasks and Pipets...

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Reading: Volumetric Flasks and Pipets Revised 10/20/04 1 VOLUMETRIC FLASKS AND PIPETS The most common types of volumetric glassware are volumetric pipets and volumetric flasks. These containers are calibrated at a specific temperature to deliver or contain VERY PRECISE amounts of liquid. Heating the glassware or using heated solutions distorts the calibrated volume! Volumetric ("vol") containers are expensive and should be handled with care. Care of Volumetric Glassware Wash glassware with a mild dilute soap solution. Rinse first with tap water, and then deionized (DI) water. If beads of water form on the walls, rewash the glassware. If glassware is to be dried, allow it to drain or use lint-free paper towels. Never dry volumetric glassware in an oven! The heat will distort the glass and change the calibrated volumes. Never dry glassware using air jets! The air system contains oil droplets and fine dust, also the compressed air can break the glass. A volumetric flask should always be rinsed with a small amount of the solvent to be used. This step prevents contamination of the solution from water or other contaminates on the glassware’s inside walls and removes the need to dry the flask. A volumetric pipet should always be rinsed with a small amount of the solution to be used. This step prevents contamination or dilution of the solution from water or other chemicals on the glassware’s inside walls and removes the need to dry the pipet. After an experiment is completed, drain all chemicals from glassware, pouring them into marked collection containers in the hoods. Wash the glassware, rinse thoroughly, and return to common storage area at the front of the laboratory.
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  • Spring '10
  • Dr.KimberlyEdwards
  • Laboratory glassware, Pipet, pipets, volumetric flasks, volumetric pipet, Pipets Volumetric Pipet

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