pH Rainbow Tube Demonstration

The lesson here is a good one and it applies to all your favorite demonstrations—they make terrific inquiry labs for your students!

This video is part of the Flinn Scientific Best Practices for Teaching Chemistry Video Series, a collection of over 125 hours of free professional development training for chemistry teachers –http://elearning.flinnsci.com

ATTENTION: This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting.

Blue-Bottle Reaction

Courtesy of Amanda, Wikimedia Commons

Courtesy of Amanda Slater, Wikimedia Commons

 

««« By James Palcik

A solution is prepared containing a dye. The dye, methylene blue, is colourless in a reduced state. Upon shaking the solution, the dye is oxidized and displays a blue colour. As the solution stands undisturbed, the dye fades to colourless as it is reduced. The cycle may be repeated over and over.
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