Method
Experiment 1-
- Mix 1 tablespoon of cornstarch into enough water to make a paste.
- To this paste, add exactly 250 millilitres of water and boil for five minutes. Allow to cool.
- Add 10 drops of the starch solution to 75 millilitres of water by using the eyedropper.
- Add enough iodine to produce a dark purple-blue color. Now the indicator solution is ready.
- Put 5 millilitres of indicator solution (roughly 1 teaspoon) in a 15-milliliter test tube (one for each sample)
- To the test tube, use a clean eyedropper to add 10 drops of juice from teh fresh fruits. For solids, pulp them in a blender and strain the juice well. Washand clean the eyedropper for each sample. Shake well.
- Place all of the test tubes against a white background.
- Line up the tubes from lightest to darkest purple. The lighter the solution, the higher the level of Vitamin C content. That's because Vitamin C causes the purple indicator solution to lose its color.
Experiment 2-
- Repeat the whole process of Experiment 1.
- Repeat the whole process of Experiment 1, this time with the concentrate juices, not the pure ones.
- Compare the amount of Vitamin C of the concentrate juices and the fresh pure ones
Experiment 3-
- Do the whole process of Experiment 1, but use Kool-aid, Sunny Delight, and, C-plus instead of the fruit juices.
- Compare the results from these juices with the juices with the juices from concentrate and the fresh pure ones.
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