Exp 7 - 1 Theoretical yield(g 2 Weight of camphor(g 3...

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TA: HSIEN-PO CHIU Nov 6 & 8, 2007 Exp 7. Preparation of camphor Principle 1. Oxidation of alcohol OH OH OH O H O OH O 1 o -OH aldehyde carboxylic acid 2 o -OH ketone 3 o -OH 2. Reaction OH + NaOCl CH 3 COOH O + NaCl + H 2 O isoborneol sodium hypochlorite camphor 3. Oxidation by hypochlorite, the laundry bleach NaOCl + CH 3 COOH HOCl + CH 3 COONa HOCl + H + + e - 1/2 Cl 2 + H 2 O E=1.63 V OCl - + H 2 O + 2e - Cl - + 2OH - E=0.89 V 1/2 Cl 2 + e - Cl - E=1.36 V 4. Detection of hypochlorite by starch-KI test HOCl + H + + 2e - Cl - + H 2 O 2I - I 2 + 2e - I 2 + starch I 2 -starch deep blue color 5. Quench oxidation of hypochlorite HOCl + HSO 3 - HCl + HSO 4 - Procedure : see page.70 Result to be reported
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Unformatted text preview: : 1. Theoretical yield (g) 2. Weight of camphor (g) 3. Reaction yield (%) Q&A 1. When hypochlorous acid is in excess, starch-potassium iodide indicator gives a positive test when the indicator turns (A) blue black (B) white (C) pink (D) yellow 2. It’s important that NaOCl is added at a slow rate to borneol and acetic acid because (A) NaOCl can destroy excess oxidizing reagent (B) it slows down the rate of the reaction (C) borneol must be in excess during the reaction (D) all of the above...
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