2CLabManual201303

We must therefore consume vitamin c current daily

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Unformatted text preview: ost suffered nutritional deficiencies, scurvy, which was especially threatening for sailors on long voyages in the 18th century. Vitamin C is chemically known as L-ascorbic acid, and human beings do not possess the biochemical metabolic pathways to produce it in the body. We must therefore consume Vitamin C (current daily recommendation is 60 mg) from various foods. It is found in many fresh fruits and vegetables such as sweet peppers, spinach, and citrus juices. In this experiment, you will determine the Vitamin C content in various Vitamin C tablets readily available to the consumer at neighborhood drug stores. This determination will utilize the fact that L-ascorbic acid is readily oxidized to L-dehydroascorbic acid according to the following oxidation half-reaction (which has an oxidation cell potential of 0.127 V at pH = 5): You will use another organic molecule, N-bromosuccinimide (NBS), as the oxidizing agent. The pertinent reduction half reaction is: 75 The "indicator" in the "redox" titration you will be doing is actually generated in place by a second redox reaction aft...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.

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