1. Use the average concentration of vitamin C from your data, and calculate the

Question

1. Use the average concentration of vitamin C from your data, and calculate the volume of fruit drink that would satisfy your minimum daily requirement of vitamin C. Show your work.

2. Vitamin C is ascorbic acid. If you examine the structure of ascorbic acid given in the Introduction section (equation 2), there is no —COOH group present. In the structure shown, the ascorbic acid is as a lactone or cyclic ester. Draw the structure of ascorbic acid, circle the lactone, and draw the structure that results from hydrolysis of the lactone.

3. Refer to the oxidized structure of Vitamin C in the Introduction section. What functional group forms as a result of the oxidation?

4. When the Vitamin C gets oxidized, what happens to the iodine?

5. In the titration, 5 drops of HCl are added. What is the purpose of the acid?

6. The iodine for this experiment is in the form of I3- , not I2 [see equation (1), Background section]. Why did the experiment require this form of iodine?

Explanation / Answer

Ans 1 -

Average concentration of vitamin C is =82.93mg/100mL

=829.3 mg/ L

The volume of fruit drink that would satisfy your minimum daily requirement of vitamin C is given as -

Daily requirement = 60mg

so it can be written in mL as = 60 / 82.93

= 72.35 mL

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