Titration of vitamin c

Determination of Vitamin C by an Iodometric Titration Purpose: The goal of this science laboratory is to determine the assiduity of vitamin C in juices and Real Lemon. A redox titration, involving an iodometric method, anyow for be used to do the analysis. The samples will be assort by their Vitamin C content. Introduction: Although just about mammals mountain synthesize vitamin C, or ascorbic acidulous (C6H8O6), from sugars, man must clear considerable quantities of this substance. The matter Academy of Sciences recommends the consumption of 60 mg of ascorbic acid per day. Vitamin C deficiency, which typically causes abnormalities in bones and teeth, was first gear characterized in sailors in the eighteenth century. These abnormalities were eliminated by compelling sailors to take limes, a etymon of vitamin C. Many ve procureables also contain king-sized quantities of vitamin C, but ascorbic acid is commonly destroyed by legion(predicate) cooking processes, and con sequently citrus fruits are regarded as the most reliable base of vitamin C. Vitamin C can be persistent in solid food by use of an oxidation-reduction reaction. The redox reaction is best-loved to an acid-base titration because a number of other species in juice can act as acids, but comparatively few mediate with the oxidation of ascorbic acid by iodine.

The solubility of iodine is increase by complexation with iodide to form triiodide I2 (aq) + I- ºI3- Triiodide then oxidizes vitamin C to dehydroascorbic acid C6H8O6+ I3-+ H2O ? C6H6O6+ 3I-+ 2H+(2) Vitamin C dehydroascorbic acid The endpoint is indicated b y the reaction of iodine with starch suspens! ion, which produces a blue-black product. As long as vitamin C is present, the triiodide is quickly converted to iodide ion, and no blue-black iodine-starch product is observed. However, when all the vitamin C has been oxidized, the excess triiodide (in sense of balance with iodine) reacts with starch to form... If you want to get a full essay, order it on our website: OrderCustomPaper.com

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