The Alka-Seltzer tablets contain sodium bicarbonate and citric acid. As the Alka-Seltzer tablet dissolves in water, the citric acid
reacts with the sodium bicarbonate to produce carbonic acid (Equation 1) and carbon dioxide (Equation 2). The carbonic acid
then reacts with the basic sodium hydroxide to change the pH of the solution (Equations 3 and 4). As the base is consumed, the
solution will slowly become more acidic, resulting in the colour changes.
Click here to go to the source of ‘Alka-Seltzer® Rainbow’.
Watch as the Flinn Scientific Tech Staff demonstrates “How To Tirate Using a Buret.” To view more How-To videos by Flinn Scientific visit us at http://www.flinnsci.com/teacher-resou…
This demonstration is intended for and should only be performed by certified science instructors in a safe laboratory/classroom setting.
Vinegar may have a powerful smell, but did you know it’s actually a weak acid? In the chemical economy, acids actively give away their protons while bases actively collect them — but some more aggressively than others. George Zaidan and Charles Morton use the currency of subatomic particles to explain this unseen exchange.
Lesson by George Zaidan and Charles Morton, animation by Karrot Animation
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.