A 5.00 mL sample of filtered orange juice was treated with 50.00 mL of 0.01019 M I3– to oxidize ascorbic acid to dehydroascorbic acid. After the oxidation was complete, excess I3– was back- titrated with 13.96 mL of 0.07125 M Na2S2O3 to starch indicator endpoint. What is the concentration of ascorbic acid (MM = 176.12) in the orange juice? Report the concentration ascorbic acid in mg/100mL. C6H8O6 + I3– → C6H6O6 + 3I- + 2H+I3– + 2S2O32- → S4O62- + 3I2A. 82.51 % B. 42.89 % C. 27.34 % D. 40.85 %

Answered: 5.00 mL sample of filtered orange juice…

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 5.00 mL sample of filtered orange juice was treated with 50.00 mL of 0.01019 M I₃^– to oxidize ascorbic acid to dehydroascorbic acid. After the oxidation was complete, excess I₃^– was back- titrated with 13.96 mL of 0.07125 M Na₂S₂O₃ to starch indicator endpoint. What is the concentration of ascorbic acid (MM = 176.12) in the orange juice? Report the concentration ascorbic acid in mg/100mL.

C₆H₈O₆+ I₃^– → C₆H₆O₆+ 3I^-+ 2H⁺

I₃^– + 2S₂O₃^2-→ S₄O₆^2-+ 3I₂

A. 82.51 %

B. 42.89 %

C. 27.34 %

D. 40.85 %

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