Tulysis Tor vitamin 1. Write a balanced equation for the reaction between 1, and

Question

Tulysis Tor vitamin 1. Write a balanced equation for the reaction between 1, and ascorbic acid. Identify the oxidizing agent and the reducing agent. 2. A solution of 1 as sta ducing aqe ed with ascorbic acid (Asc). Using a0.1137'g sample of purd ascorb acid, 26.75 mL, of I, were required to reach the starch end point a. What is the molarity of the iodine solution? 0. 024 M b. What is the titer of the iodine solution? mg Asc/mL 1, 3. A sample of fresh grapefruit juice was filtered and titrated with the above I, solution. A 100-mL sample of the juice took 10.26 mL of the iodine solution to reach the starch end point a. What is the concentration of vitamin C in the juice in mg vitamin C/100 mL of juice? 0.024 x o. 0102b 0.000 24bmoltS/o.IL o. oDa4bM x 17b.129 332 g/1o ml b. What quantity of juice will provide the RDA amount of vitamin C?

Explanation / Answer

Solution:

1.

C6H8O6 + I2(aq) ightarrow C6H6O6 + 2 H+(aq) + 2 I-(aq)

I2 + 2e- ightarrow 2I- Oxidation reaction

C6H8O6 ightarrow C6H6O6 + 2 H+ + 2e- Reduction reaction

Ascorbic acid is oxidized to dehydro-ascorbic acid. Two alcohol-functional groups are oxidized to become keto-functional and two hydrogens are lost.

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