How do I test for the rate of vitamin C in a different selection of fruit juices? I want to know the apparatus that should be used and process of this experiment.

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I am assuming by rate of vitamin C you are talking about testing for the vitamin C levels in various fruit juices.  Vitamin C is the common name for the chemical L-ascorbic acid, which is an important chemical for human body chemistry.  There is a very simple test that can be done to test for vitamin C.  Vitamin C is an antioxidant that can be used to reduce other chemicals.  When a solution of iodine (I2) is added to vitamin C, the iodine is reduced to the iodide anion (I-).  I2 is a deep purple colored liquid but I- is colorless.  So take a cup of water and add a couple of drops of iodine.  The solution will turn purple.  Add a fruit juice to this solution one drop at a time until the mixture becomes colorless.  The fewer drops used means that the fruit juice has a large amount of vitamin C.  The more drops used means that the fruit juice has a smaller amount of vitamin C.  By comparing the number of drops of the different juices used in the experiment you can rank them in terms of their vitamin C content.

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