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Nutrition In Your Food

Activity 2: See the Vitamin C?
CAUTION: DO NOT DRINK IODINE OR FOOD WITH IODINE ON IT!

I C!
In this experiment, you'll find out how much Vitamin C in your food. Having plenty of Vitamin C will help you to have healthy teeth, gums, and blood vessels.

You Will Need:
  • Measuring device in milliliters or cups
  • Eyedropper
  • Iodine
  • Cornstarch
  • Water
  • Drinking Glasses
  • Spoons
  • Fruit juice (or juice strained from a fruit)
  • Other food or liquid samples, such as milk or meat (but it needs to be liquefied)
  • Something that can heat the mixture

What to Do:

  1. Measure 1 tablespoon of cornstarch and pour into a drinking glass.  Add just enough water to make it pasty.
  1. Measure 250 milliliters (3 1/8 cup) of water and pour this into the same drinking glass.
  1. Mix the solution until the starch dissolves.  You may need to heat it in order to make it dissolve faster.
  1. Measure 75 milliliters (1 cup) of water and pour into a different drinking glass.  Then add ten drops of starch to the water with the eyedropper.  This dilutes the iodine so it’s not as strong.
  1. Then add enough iodine to this mixture that it reacts with the starch and turns a darkish blue/purple.
  1. Now measure 5 milliliters (1/10 cup) of the iodine/starch mixture and pour into a separate drinking glass.
  1. Add 10 drops of the fruit juice.  If the mixture becomes clearer, there is Vitamin C present.  Vitamin C makes iodine lose its color.
  1. You can use the iodine solution to test some other drinks and foods (liquefied or blended, of course!) The clearer the mixture, the more Vitamin C there is.  Make sure you clean the eyedropper with water each time you use it.

Experiment Demonstration

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