Experiment 1 - Experiment 1 The Chemistry of Vitamin C...

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Experiment 1: The Chemistry of Vitamin C Lacey Frigaard Lab Partner: Sam Thompson January 29, 2008 Section: Purpose: To show Vitamin C acts as a reducing agent towards iodine, compare the content of Vitamin C in commercial tablets with that on the manufacturer’s label, and illustrate the redox reactions of iodate-iodide ion reactions.
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I. DATA AND CALCULATIONS Molarity of potassium iodate (KIO 3 ) solution: 0.03 M VC = Vitamin C Average Vitamin C content per 500.00 mg tablet (as stated on label) = 250.00 mg Table I: Determination of Vitamin C Content of Commercial Tablets Data Trial 1 Trial 2 Trial 3 Mass of the Tablet & Weighing Paper 0.974 g 0.900 g 0.911 g Mass of the Weighing Paper 0.432 g 0.433 g 0.436 g Mass of the Tablet 0.542 g 0.467 g 0.475 g Volume of KIO 3 titrant N/A N/A N/A Final buret reading 17.20 mL 32.30 mL 46.50 mL Initial buret reading 0.00 mL 17.20 mL 32.30 mL Net Volume of KIO 3 Solution 17.20 mL 15.10 mL 14.20 mL Table II: Mass of Absorbic Acid Data Trial 1 Trial 2 Trial 3 Mass of Absorbic Acid 272.63 mg 239.35 mg 225.08 mg Average: 245.69 mg 17.20 mL KIO 3 _1.00 L_ _0.03 mol_ _ 3 mol VC_ __176.12 g__ 1000 mg_ = 272.63 mg 1000 mL 1.00 L
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