Upload

Loading icon Loading...

This video is unavailable.

How to Make a Red Cabbage pH Indicator (Extraction of Anthocyanins)

Sign in to YouTube

Sign in with your Google Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to like 99Chemicals's video.

Sign in to YouTube

Sign in with your Google Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to dislike 99Chemicals's video.

Sign in to YouTube

Sign in with your Google Account (YouTube, Google+, Gmail, Orkut, Picasa, or Chrome) to add 99Chemicals's video to your playlist.

Uploaded on Nov 20, 2011

In this video I will show you how to make a red cabbage pH indicator. This is a very intesting experiment that is very simple.

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 distilled 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 strainer 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 an acid envirornment it turns red (NaHSO4, HCl, Citic acid etc...)
In a neutral environment 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 raspberrys, grapes, and puple corn have similar chemicals that change color in pH.

Thanks for watching!

  • Category

  • License

    Standard YouTube License

Loading icon Loading...

Loading icon Loading...

Loading icon Loading...

Loading icon Loading...

Ratings have been disabled for this video.
Rating is available when the video has been rented.
This feature is not available right now. Please try again later.

Loading icon Loading...

Advertisement
Loading...
Working...
to add this to Watch Later

Add to