How Do You Determine The Vitamin C Concentration In Citrus Fruit?
Vitamin C is often associated with citrus fruit, but some fruit contain more vitamin C than others. You can do a simple science experiment to compare the levels of vitamin C in various fruits. This is a good idea for a science fair project or just to teach students about vitamin concentrations in foods. This requires that you make a simple iodine indicator. Iodine can be found in most drug stores. Combine the cornstarch and 1 to 2 tbsp. of water in a beaker to make a paste. Add 250 ml of water to this in the beaker. Place the beaker on a heat source and bring to a boil. Boil for five full minutes. Remove from heat. This starch solution will be used to thicken the iodine indicator. Place 75 ml (about 5 tbsp.) of water into another beaker. Add about 10 drops of the cornstarch solution to the clean water. Stir well. Drop in enough of the iodine until the 75 ml of water is a dark purple or dark blue color. This is your iodine indicator. Drop about 1 tsp. (5 ml) of your iodine indicator int
