Where to get Vitamin C Indicator Solution

[Speed]

One of the projects here at all-science-fair-projects, is requiring a Vitamin C Indicator Solution(as stated in the materials and procedures). The link to the project can be found [URL=http://www.all-science-fair-projects.com/science_fair_projects/39/471/22e80fb3060d7acb5da6997b1d6fafea.html]here[/URL]

My question is:

• Can I purchase the solution? If so which stores would have it? If it helps, I live in Los Angeles, California.

[boring_sister]

i found how to prepare one on the same site where you found the project

Directions for the preparation of vitamin C Indicators
Starch-Iodine

* Add 2 g of corn starch or potato starch in 200 mL of cold, distilled water. Bring the mixture to a full boil in a glass beaker.
* To 1 liter of water, add 8 mL of the starch solution and 1 mL of tincture of iodine.
* Note: The color of the starch indicator should be a royal blue. Just before doing the lab, check the indicator and dilute the concentration so that a workable number of drops of fresh orange juice (5 to 25) turn the indicator colorless.

Tincture of Iodine

* Add 2 g of Iodine to 45 mL of ethanol and dissolve.
* Dissolve this mixture in 55 mL of distilled water.
* Add 2.4 grams of KI to this mixture and dissolve.

Indophenol

* Stock solution : dissolve 100 mg of 2,6 dichloro-indophenol salt in 100 mL of distilled water.
* Prepare a working solution by diluting the stock solution at a 1:10 ration with distilled water.
* Note: When testing the juices of citrus fruits for vitamin C content, the blue indophenol may turn pink before turning colorless because of the presence of substances other than vitamin C.

good huh

[power kitten]

Ive done this beffore...
This is what you do...
you corn starch in cold water,boil it, and add iodine.
it should be like a blue color.......
then you put it in juce and watch the color change.
Have Fuun.

[isafr2]

Originally Posted by boring_sister

i found how to prepare one on the same site where you found the project

directions for the preparation of vitamin c indicators
starch-iodine

* add 2 g of corn starch or potato starch in 200 ml of cold, distilled water. Bring the mixture to a full boil in a glass beaker.
* to 1 liter of water, add 8 ml of the starch solution and 1 ml of tincture of iodine.
* note: The color of the starch indicator should be a royal blue. Just before doing the lab, check the indicator and dilute the concentration so that a workable number of drops of fresh orange juice (5 to 25) turn the indicator colorless.

Tincture of iodine

* add 2 g of iodine to 45 ml of ethanol and dissolve.
* dissolve this mixture in 55 ml of distilled water.
* add 2.4 grams of ki to this mixture and dissolve.

Indophenol

* stock solution : Dissolve 100 mg of 2,6 dichloro-indophenol salt in 100 ml of distilled water.
* prepare a working solution by diluting the stock solution at a 1:10 ration with distilled water.
* note: When testing the juices of citrus fruits for vitamin c content, the blue indophenol may turn pink before turning colorless because of the presence of substances other than vitamin c.

Good huh

the more drops the more vitamin c