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Video 1. A Cabbage Juice Indicator Video (Ryan C. with Rick M.- Videographer)

- Be able to describe our experiment with cabbage juice as Ryan C. does here. -JT

- Juice Diet

-Definitions:


Red Cabbage Juice is a natural indicator, that helps determine whether a solution is an acid or base by the pH number.
The pH changes when you add an acid or alkali to the solution. Another indicator is Litmus paper (red and blue) and this is also made from Cabbage juice.
pH indicators." sambal.co.uk. 10 Nov 2006 . 22 Feb 2007
<http://www.sambal.co.uk/indicators.html>.


Red cabbage juice is mixed with a series of buffers to obtain a set of color standards. Various household substances are added to red cabbage juice. By comparing the color of the resulting solution to that of the color standards, the approximate pH of the household materials is determined.
"Cabbage Juice Indicator." Teaching and Research Website. 22 Feb 2007
<http://chemmovies.unl.edu/Chemistry/DoChem/DoChem099.html>.

- What colors does cabbage juice change to depending upon the alkalinity or acidity of the substance? -JT

Anthocyanin- Any pigment or juice pH indicator that is found in nature, mainly in red/purple fruits and vegetables. Red cabbage juice is one type of anthocyanin, because it comes from a red/purple vegetable. On top of red cabbage juice, there are also beets, blueberries, cherries, raspberries, and purple grapes that have anthocyanins in their pigments/juices.
Unknown, "Anthocyanins." Sci Network. 11 Dec 2006. MadSci. 22 Feb 2007
<http://www.madsci.org/FAQs/anthocyanins.html>.

- This is the natural pigment that changes color depending upon the acidity or alkalinity (if it is basic). - JT

Flavonoid- A flavonoid is a group of chemicals. Anthocyanin belongs to this group.
Unknown, Unknown. "Cabbage Juice: pH Indicator." Cabbage Juice: pH Indicator. Dec 11 2006. Mad Science Net. 22 Feb 2007 http://www.madsci.org/experiments/archive/859332497.Ch.html.

-Recipe

Below is a recipe for the red cabbage juice pH tester.

1) Take one cup of shredded red cabbage and boil it in two cups of water for 5 minutes in a non-aluminum pan.
2) Strain out the cabbage and keep water. The water should be purple. If it is any other color, throw this set away and try again.
3) Refrigerate any red cabbage juice that you do not use immediately. It will keep for up 2 days. Frozen cabbage juice can be kept for months.
Johnson, Marian. "Indication For Acids and Bases." SMILE. 1 Feb 2007 . Illinois Institute of Technology. 22 Feb 2007 http://www.iit.edu/~smile/ch9310.html.

-Data:

All neutral solutions were purple after the cabbage juice was added.
All of the acidic solution changed to pink after the cabbage juice was added.
All of the basic solutions changed to green/blue after the cabbage juice was added.




external image PourCabbageJuiceIntoBeaker5.jpg
Figure 1. Cabbage juice in beaker
No author cited "<-CHM-107Lab Home Page", 2/22/2007
http://www.chemistryland.com/CHM107Lab/Lab1/PourCabbageJuiceIntoBeaker5.jpg

-Analysis:


external image cabbage.gif
Figure 2. Results of Cabbage Juice
No author cited "Acids and Bases" 2/22/07
http://images.google.com/imgres?imgurl=http://wwwchem.csustan.edu/chem3070/images/cabbage.gif&imgrefurl=

external image pH.jpg
||
Figure 3. Cabbage Juice Colors
No author cited "Great Science Projects from The Great Lakes Science Center." 22 Feb 2007.
http://www.glsc.org/think/projects.php?id=21.

- Observe the colors above and be familiar with them. -JT


external image PourCabbageJuiceIntoBottle2.jpg
Figure 4. Pouring Cabbage Juice

No Author Cited, "Lab #1 Part 2." 3 Mar 2004. Chem-107- Home Page. 22 Feb 2007 <http://www.chemistryland.com/CHM107Lab/Lab1/Lab1PreparingCabbageExtract.htm

-Other natural pH indicators:

Beets
Blackcurrant juice
Blueberries
Carrots
Cherries
Curry powder
Delphinium petals
Geranium petals
Grapes
Horse Chestnut leaves
Hydrangea
Morning Glories
Onion
Pansy petals
Petunia petals
Poison primrose
Poppy petals
Purple peonies
Rayhan leaves
Red cabbage juice
Red radish
Rhubarb
Rose petals
Strawberries
Tea
Thyme
Turmeric
Tulip petals
Violet petals




juicing diet