1. Ascorbic acid (Vitamin C) reacts with 13 using starch as the indicator. The endpoint is marked by the appearance of a deep blue starch iodine complex when the first fraction of a drop of unreacted 13 remains in the solution. A) If 29.41 mL of 13 solution is required to react with 0.1970 g of pure ascorbic acid, what is the molarity of the 13- solution? B) A Vitamin C tablet containing ascorbic acid plus an inert binder was ground to a powder and 0.4242 g was titrated by 31.63 mL of 13. Find the weight percent of ascorbic acid in the tablet.

1. Ascorbic acid (Vitamin C) reacts with 13 using starch as the indicator. The endpoint is marked by the appearance of a deep blue starch iodine complex when the first fraction of a drop of unreacted 13 remains in the solution. A) If 29.41 mL of 13 solution is required to react with 0.1970 g of pure ascorbic acid, what is the molarity of the 13- solution? B) A Vitamin C tablet containing ascorbic acid plus an inert binder was ground to a powder and 0.4242 g was titrated by 31.63 mL of 13. Find the weight percent of ascorbic acid in the tablet.

World of Chemistry, 3rd edition

3rd Edition

ISBN:9781133109655

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

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

Chapter15: Solutions

Section: Chapter Questions

Problem 61A

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