How to Make a Red Cabbage pH Indicator (Extraction of Anthocyanins)
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Uploaded by 99Chemicals on Nov 20, 2011
In this video I will show you how to make a red cabbage pH indicator. This is a very cool experiment that is very simple and very intresing.
What you will need:
Red cabbage
Distilled water (Reverse osmosis will work too)
A stove or heat source
First cut the cabbage leaves into small pieces and add them to disstilled water and bring to a boil, let it boil for 2 minutes and then turn off heating and let cool slowly.
Now you have your indicator and some cabbage pieces. Use a strianer or coffee filter to remove particles.
The deep purple solution is your indicator you can refrigerate it for short term use or add 15% volume of alcohol (im using 91% isopropanol)
You can test the indicator by adding acids and bases
in acid enviornment it turns red (NaHSO4, HCl, Citic acid etc...)
In a Neutral enviroment its purple (Distiled H2O)
In mild bases it is blue (Sodium Acetate)
In weak bases it is blue green (NaHCO3)
I medium strong bases it is dark green (Na2CO3)
In very strong bases it is yellow (NaOH)
The active chemical in the indicator is Anthocyanins they change color in acid and basic enviornments. Red cabbage is high in Anthocyanins but other plants like rasberrys, grapes, and puple corn have similar chemicals that change color in pH.
Thanks for watching!
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That is cool u sound tike a real scientist i need to bring the indacator in because we are doing a lab at school. Also Try Lemon Jucie or kool-aid, ans see what happens. But dont ask me i dont know yet i won't know till wed. , December 14 2011
CraftsGal101 3 months ago
@CraftsGal101 Lemon juice and Kool-aid both would be red because they both contian citric acid. Probably in the 3 - 5 pH range.
99Chemicals 2 months ago
im just a little bit curios how old are you myself im eleven
thegodofchemistry 3 months ago
@thegodofchemistry I'm 14. I know theres lots of errors, I upload this late lastnight and dint have time to fix it. Will do that now
99Chemicals 3 months ago