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I made ScienceFix.com to share my favorite demos that I do in my middle school science classes.  

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Monday
Jan162012

pH Pipes

Indicators are chemicals that show what type of chemical reaction occurred. I decided to have some fun with some pH indicators--chemicals that signify if a solution is acidic or basic. In the video, 3 different pH indicators, bromothymol blue, phenol red, and phenolphthalein (and ammonia) are used. The solutions are in long plastic pipes whereupon Alka Seltzer tablets are dropped. The Alka Seltzer tablets react with the water to produce carbon dioxide gas. The carbon dioxide dissolves in water creating carbonic acid and thus making the solution more acidic. The color of the solution changes as a result. Later ammonia, a base, is added to show how the color changes when the solution turns basic.

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Reader Comments (3)

I want these for my live water experiments! You know using DC to smash h2o molecules :)

January 21, 2012 | Unregistered Commenteržogs

Dear Sir,
your all vedio is very good plz uplord a new vedio in this i want seen this,how to peparation Prphosphorus trichloride PCL3

February 8, 2012 | Unregistered CommenterPrphosphorus trichloride

These are great- must visit for all students and teachers…
ScholarshipsPedia
Thanks!

February 19, 2012 | Unregistered CommenterRashmi

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