In Chemical Mystery #13, the contents of a "magic" cup were poured over a blue-colored cleaner. As a result, the color of the cleaner immediately changed from blue to white. In another case, the color change occurs when the magic cup is simply held over the cleaner. Finally, waving a "magic" hand over the cleaner also causes the blue-to-white color change. These magic tricks are actually modifications of some experiments I did a few years ago. These magic tricks are useful to perform for students when discussing several concepts related to acid-base chemistry. My students are usually fooled! You can check out how to do these tricks in the video below:
Let me know if you try out this experiment for your students. Happy experimenting!
Please refer to the ACS Guidelines for Chemical Laboratory Safety in Secondary Schools (2016). Some additional information on these guidelines can be found in a Pick at ChemEd X.
RAMP: Recognize hazards; Assess the risks of hazards; Minimize the risks of hazards; Prepare for emergencies