Instructional Videos

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Chem 110 Caffeine - Part One

The following videos should be viewed as part of your preparation for the Isolation of Caffeine from Tea experiment. All videos are available in full HD quality and can be viewed in full screen.

Part One of this experiment uses the technique of solvent extraction.

Part Two makes use of the technique of thin-layer chromatography.

The Bunsen Burner (3:13)

Students sometimes find it troublesome to ignite the gas on a laboratory Bunsen burner. This very short video clearly shows how to set up the Bunsen so that the gas will ignite easily.  Tha anatomy of the Bunsen flame is examined, allowing you to know how to best use the apparatus to your advantage. Such a lot of useful information packed into this very short video!

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Solvent Extraction (9:31)

Solvent extraction is used in Part One of this experiment to isolate caffeine from a host of other compounds in tea leaves. This video gives a brief overview of the technique, explaining how it works, together with some of the special terminology used. The video will provide the student with some advanced insight to this organic chemistry technique.

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Chem 110 Caffeine - Part Two

Thin-Layer Chromatography (10:17)

This video provides a general perspective of the method of thin-layer chromatography which will be used in part two of this experiment as a qualitative assessment of the caffeine isolated in part one.

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