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Neither is more accurate than the other. The starch-iodine mixture is much cheaper. It can be made ahead and stored in a dark, cool place in two liter soda bottles and dispensed in liter containers at the lab stations. Both indicators vary from one preparation to the next; so an accurate measure of vitamin C is not really possible with this protocol. The results allow students to compare relative amounts of vitamin C present.
Starch-Iodine
# Add 2 g of cornstarch 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...
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