Checking the Buret
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Summary
The buret is filled with water, drained, and examined to be sure it is quantitatively clean. The 13 thumbnail images summarize the content of the video. Click an image to see the image gallery.
Narration
We prepare our buret for use by checking to see that the stopcock is closed, filling the buret with deionized water and then checking for quantitative drainage. We need to examine the buret to be sure its walls drain cleanly, both to prevent contamination and to be sure that titrant volumes are accurately read. Place a waste beaker beneath the buret tip and open the stopcock to allow the deionized water to empty from the buret.
This buret is droplet free; it is quantitatively clean. If droplets do show up on your buret, further cleaning will be required.
Discussion
This movie begins by showing the completion of the rinsing started in the previous movie.
Students should check to make sure the buret stopcock is closed before deionized water or titrant is added to the buret. This movie does not show this step.
One should wait a minute or two after the buret has completely drained before checking for quantitative drainage. It is not unusual for droplets to appear on the inner wall of the buret after some time has passed.
If a buret does not drain quantitatively, use whatever procedure has been approved locally to clean it.
Keywords
Applications of Chemistry | Laboratory Equipment / Apparatus | Quantitative Analysis | Titration / Volumetric Analysis
These ChemEd DL Resource Groups Include This Video
A Complete Acid-Base Titration
Titration
Measuring
A Complete Acid-Base Titration
Quantitative Acid-Base Titration
Quantitative Techniques in Volumetric Analysis
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