The new Cabbagindicator!
A new indicator! For kids!
A natural indicator!
The Cabbagindicator is a non-toxic substance and is fun to use! It is made of red cabbage juice. It's easy to make and have a wide range of colors. It's a good way to show your students that chemistry is in their day routine not just in the Chemistry class.
How does it work?
An acidic solution contains an excess of protons or H+. pH is a measure of how 'acidic' a solution is. The lower the pH, the more acidic the solution. In chemical terms, pH means "the negative log of the concentration of protons" in solution.
What is the color range?
Suggestions
- Use substances that you are sure of its pH.
- Don't forget the safety procedures, use safety glasses.
- It would save more time, if you already have the red cabbage juice, before the experiment. So just buy the Cabbagindicator! It's cheap and already in the liquid form!
Guaranteed to be fun and educational!
References
https://www.youtube.com/watch?v=I18K2upEHLc
http://chemistry.about.com/od/acidsbase1/a/red-cabbage-ph-indicator.htm
http://www.stevespanglerscience.com/lab/experiments/red-cabbage-chemistry/
http://www.ucl.ac.uk/chemsea/experiments.php?exp_n=1
http://www.sciencebuddies.org/science-fair-projects/project_ideas/Chem_p013.shtml