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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.
- Spring '07