Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Concept explainers

Potentiometric Titrations
Potentiometric titration is one of the important titration methods and is mainly carried out to characterize acid solutions. It follows a method similar to that of the normal titration technique, but the main difference is that there is no indicator used…
Question

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- + 3I2

   

42.89 %
   

40.85 %
   

27.34 %
   

82.51 %
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