CHE134 Summer Lecture 10

CHE134 Summer Lecture 10 - DETERMINATION OF VITAMIN C TEST...

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DETERMINATION OF VITAMIN C TEST EXERCISE (105 POINTS) 11
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DETERMINATION OF VITAMIN C TEST EXERCISE (105 POINTS) KIO3 I2 I- KI TITER 22
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Objective: To determine VITAMIN C content of an Unknown Concepts: Oxidation/Reduction Iodometry Optical Activity Techniques: Titration Weighing Apparatus: Buret Balance 33
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Effective VITAMIN C is REDUCED form C6H 8 O6 C6H 6 O6 - 2 H HO HO O H H HO OH H C C O C C C C Reduced Form Oxidized Form 8 O7 O O O H H HO OH H C C O C C C C C6H 6 O6 Reduction is the addition of H2 Oxidation is the removal of From last semester: 44
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HISTORY OF THE VITAMIN 1500- : A fatal disease common in seamen on 1600's long voyages appears to be prevented by sucking citrus fruits such as LIMES 1753: The disease SCURVY is described (Lind) 1907: Experimental SCURVY is produced “ship beri-beri” 1928: ANTI-SCORBUTIC (SCURVY) AGENT in LEMON JUICE is described Serendipity http://www.bbc.co.uk/sn/tvradio/programmes/horizon/broadband/archive/gyorgyi/ 55
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1932: Waugh and King identify HEXURONIC ACID as the ANTI-SCORBUTIC AGENT in lemon juice 1933: Molecule’s configuration is established VITAMIN C is synthesized Name changed to ASCORBIC ACID Since then, VITAMIN C has enjoyed a major role in both the scientific and popular literature. Linus Pauling: 1901 - 1994 66
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VITAMIN C is essential for: formation of collagen, bones, teeth, wound healing, growth, etc., etc. Kidney, liver or intestinal bacteria of most animals produce VITAMIN C in the required amount Most living organisms have enzymes that permit the conversion of glucose to ascorbic acid . Most fruits and vegetables seem to abound in them C6H 12 O 6 C6H 8 O6 enzymes 77
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The oxidation of vitamin C involves the addition of Hydrogen atoms across a double bond. 1. True 2. False 88
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the addition of Hydrogen atoms across a double bond. 2.
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CHE134 Summer Lecture 10 - DETERMINATION OF VITAMIN C TEST...

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