I dont know how to go about doing this can someone help? Name Section Experiment

Question

I dont know how to go about doing this can someone help?

Name Section Experiment 43 Advance Study Assignment: Analysis for Vitamin C 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 I, was standardized with ascorbic acid (Asc). Using a 0.1032-g sample of pure ascorbic acid, 25.51 mL of 1, titrant was required to reach the starch end point. a. What is the molarity of the iodine solution? b. What is the titer of the iodine solution? mg Asc/mL 1 (continued on following page

Explanation / Answer

Ans 1

The balanced reaction

C6H8O6 + I2 = 2I- + 2H+ + C6H6O6

I2 = oxidizing agent

C6H8O6 = Reducing agent

Ans 2

Part a

Mass of ascorbic acid = 0.1032 g

Moles = mass/molecular weight

= 0.1032 g / (176.124 g/mol)

= 5.859 x 10^-4 mol

Volume = 25.51 mL x 1L/1000 mL = 0.02551 L

Molarity = moles/Volume

= 5.859 x 10^-4 mol / 0.02551 L

= 0.0229 M

Part b

Titer of solution = Mass of ascorbic acid / volume of I2

= (0.1032 g x 1000mg/g) / (25.51 mL)

= 4.045 mg asc / mL I2

Ans 3

Part a

Titer of solution = (4.045 mg asc / mL I2) x 11.86 mL I2

Concentration of Vitamin C = 47.979 mg

Concentration of Vitamin C / 100 mL juice

= 4797.9 mg/100 mL juice

Part b

recommended daily intake of vitamin C = 2000 mg

Volume of juice = 2000 mg / (4797.9 mg/100 mL juice)

= 41.68 mL

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