volumetric flask


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

volumetric flask

[¦väl·yə¦me·trik ′flask]
(analytical chemistry)
A laboratory flask primarily intended for the preparation of definite, fixed volumes of solutions, and therefore calibrated for a single volume only.
References in periodicals archive ?
The standard stock solution of praziquantel (100 [micro]g/mL) was used to prepare a set of diluted standard solutions of various concentrations (1-20 [micro]g/mL) prepared by pipetting appropriate volumes (0.1, 0.5, 1, 1.5, 2 mL) of stock solution into 10.0-mL volumetric flasks and adjusting the volume to the mark with distilled water.
In order to prepare 100 mL of 0.2% w/v positive quality control, 200 mg of caffeine standard was accurately weighed and dissolved in 50 mL distilled water in volumetric flask and, in the end, the final volume made up to 100 mL with distilled water.
To prepare the energy inhibitor 2,4-dinitrophenol stock solution, 2,4-dinitrophenol was precisely weighed at 0.9225 g, and placed in a 25-mL volumetric flask. Then, the acetone solution was added to dilute the solution to the required scale, and the solution was shaken well before use.
(6) Cylindrical stainless steel volumetric flasks were used (100 mm in diameter, 650 mm in height).
Serial dilutions were prepared from the stock solution of hydrocortisone reference standard (1 mg/ml) by pipetting 8.0 ml, 4.0 ml, 2.0 ml, 1.6 ml, 0.8 ml, and 0.4 ml of the stock solution into separate 20 ml volumetric flasks. The solutions were made up to volume with the diluent and mixed thoroughly.
The mixture was heated at 100 degC for 20 minutes on water bath and after cooling transferred to volumetric flasks and made the volume up to 10 mL with distilled water.
In 1000 ml volumetric flask 600 ml of Potassium Hydroxide buffer was transferred and then 400 ml Acetonitrile to prepare a mobile phase.
Subsequently, the fraction in ethyl acetate was washed with two portions of distilled water, and this new solution of acetate was transferred to 50 mL volumetric flask with a volume of ethyl acetate (mother solution, SM).
10 ml of the filterate was taken out using a pipette and transferred to a 100ml volumetric flask. Required volume of working concentration of 50g/ml was obtained by using 0.1N HCl.
Gravimetric addition of the diluent also means the amount of solution prepared is not dictated by the sizes of volumetric flask that the operator has to hand.
After cooling, the mixture was transferred to a 250.0 mL volumetric flask and topped with water, then, the plant material was decanted.

Full browser ?