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+ LDV Room BUL Pre-Laboratory Exercise: Show all work to receive full credit. 1. Name three fruits and/or vegetables that are good sources of vitamin C. Guava, Kiwi, orange 2. In the jodine ascorbic acid reaction which is the (a) oxidizing agent? (b) the reducing agent? Which is (c) oxidized (d) reduced? (a) ascorbic acid (b) iodine (c) oxidized (d) reduced 253.88 3. 27.46 mL of I was standardized with a 0.1000 g sample of ascorbic acid. At the blue starch end point, what is the (molarity of the l: solution? m ms 253-87.1 LOZmo 27.460mL Somal 0275L MI: 4. A sample of orange juice was titrated with the standardized iodine solution from the previous problem. A 100 mL sample of juice took 9.24 mL of lz to reach the starch end point a. Write the reaction of vitamin C with iodine. C6H8O6 + Iz Cu H606+ 2H²+2 I b. What is the stoichiometric ratio of vitamin C to iodine in the reaction? 112 c. What is the concentration of the vitamin C in units of mg Vit C/100 ml juice? mg Vit C 100 mL d. How much of the juice does one need to drink to meet the RDA standard amount of vitamin C for one day? _mL juice Appendix - 37

Answer 1

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