A 500-mg tablet of commercial vitamin C tablet was dissolved in 50 mL water, treated with excess KI solution and 3 drops of starch solution. The solution required 4.8 mL of 0.05 M KIO3 to reach the endpoint. Calculate the % by weight of vitamin C in the tablet. (Molar mass of vitamin C = 172.16 g mol-1) IO3‐ + 5 I‐ + 6 H+ → 3 I2 + 3 H2O (1)I2 + C6H8O6 → C6H8O6* + 2 H+ + 2 I‐ (2)I2 + starch → (I2 - starch) (deep blue color) (3) *oxidized product of vitamin C

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Answered: A 500-mg tablet of commercial vitamin C…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A 500-mg tablet of commercial vitamin C tablet was dissolved in 50 mL water, treated with excess KI solution and 3 drops of starch solution. The solution required 4.8 mL of 0.05 M KIO₃ to reach the endpoint. Calculate the % by weight of vitamin C in the tablet. (Molar mass of vitamin C = 172.16 g mol^-1)

IO₃^‐ + 5 I^‐ + 6 H⁺ → 3 I₂ + 3 H₂O (1)

I₂ + C₆H₈O₆ → C₆H₈O₆* + 2 H⁺ + 2 I^‐ (2)

I₂ + starch → (I₂ - starch) (deep blue color) (3)

*oxidized product of vitamin C

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