14) Lab Essentials : Volumetric Flask

Microbiology Lab Essentials :

Glasswares : 

14) Volumetric Flask (Glass ) :

A volumetric flask is lab glass or plasticware used to prepare a solution. 

It is used to make up a solution to a known volume. Volumetric flasks are used to measure volumes much more precisely than beakers or Erlenmeyer flasks.

volumetric flask (vol flask for short) is a type of laboratory glassware. 

It is used to hold and measure accurate amounts of liquid. 

It is shaped like a Florence flask, but has a flatter bottom.

The neck is narrow to make measurements more exact when making a solution.

The volumetric flask is used for measuring accurate volumes of liquid materials for laboratory experiments. They are favored when available because they are more accurate than graduated cylinders and beakers, which are other pieces of equipment that are used to measure liquids.

A volumetric flask (measuring flask or graduated flask) is a piece of laboratory apparatus, a type of laboratory flask, calibrated to contain a precise volume at a certain temperature.

The marking is typically calibrated "to contain" (marked "TC" or "IN") at 20 °C and indicated correspondingly on a label.

How to Use a Volumetric Flask :
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 solution and the line on the flask to determine your endpoint.

Capacity of Volumetric Flasks are :

25 ml , 50 ml , 125 ml , 250 ml , 500 ml ,1000 ml , 2000 ml , 4000 ml etc...