pH

Assassin's Bottle title card
Ramping Up the Disappearing Rainbow with the Assassin’s Water Bottle
// Tuesday, September 16, 2025 • Tom Kuntzleman
The disappearing rainbow1 is a wonderful chemistry demonstration previously featured here on ChemEdX.2-4 In this experiment, a colorless solution of NaOH is poured into a row of flasks, each containing a different acid–base indicator.
February 2019 Cover of the Journal of Chemical Education
Especially JCE: February 2019
// Wednesday, February 13, 2019 • Erica K. Jacobsen
When was the last time you thought about paper? Really thought about it. Even before the shift to a digital age, with a push to go paperless, it was somewhat a throwaway, unnoticed material. But, it is one rich in chemistry.
Muffins
Acid, Base, pH and Food Chemistry
// Friday, June 9, 2017 • Chad Husting
I try to examine activities an multiple levels. First on the list, I want to know if my students will be engaged and learn something. Second, how difficult is it for me as a teacher to actually pull it off? One of the most important questions...are the students learning chemistry or just having fun?
Especially JCE: July 2016
// Tuesday, July 12, 2016 • Erica K. Jacobsen
Back to school time means back to lab time too. Students new to chemistry have a lot on their plates the first few labs—learning unfamiliar safety procedures, becoming accustomed to writing lab reports, even figuring out which glassware they’re looking for in their lab space. How can teachers help them to navigate this newness?