Saturday, January 26, 2013

Chemistry lab equipments: Glasswares used in chemistry Labs

We have heard from many people about how useful the list of common chemistry lab equipments with pictures have been. In an effort to provide more information about common equipments used in chemistry abs, we have put together a list of common glasswares used in a chemistry labs with pictures and descriptions in this post. Please, let us know if we are missing anything or of you have any questions.


Buret

A buret is used to deliver solution in precisely-measured, variable volumes. Burets are used primarily for titration, to deliver one reactant until the precise end point of the reaction is reached.


Click here for instructions on how to use a Buret
Erlenmeyer Flasks and Beakers
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Erlenmeyer flasks and beakers are used for mixing, transporting, and reacting, but not for accurate measurements. The volumes stamped on the sides are approximate and accurate to within about 5%.
Graduated Cylinders
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Graduated cylinders are useful for measuring liquid volumes to within about 1%. They are for general purpose use, but not for quantitative analysis. If greater accuracy is needed, use a pipet or volumetric flask.

Pipet
Image 1
A pipet is used to measure small amounts of solution very accurately. A pipet bulb is used to draw solution into the pipet.




Repipet

A repipet is a hand operated pump that dispenses solution. Its volumes are accurate to within about 2%. If you need a more precise volume measurement, remeasure at your bench using a more precise piece of glassware, like a graduated cylinder, pipet, or buret.

Volumetric Flask
Image 1
A volumetric flask is used to make up a solution of fixed volume very accurately. This volumetric flask measures 500 mL ± 0.2 mL. This is a relative uncertainty of 4 x 10-4 or 400 parts per million.

To make up a solution, first dissolve the solid material completely, in less water than required to fill the flask to the mark.

Image 2
After the solid is completely dissolved, very carefully fill the flask to the 500 mL mark. Move your eye to the level of the mark on the neck of the flask and line it up so that the circle around the neck looks like a line, not an ellipse. Then add distilled water a drop at a time until the bottom of the meniscus lines up exactly with the mark on the neck of the flask. Take care that no drops of liquid are in the neck of the flask above the mark.
Image 3
After the final dilution, remember to mix your solution thoroughly, by inverting the flask and shaking.

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