7-A. Ascorbic acid (vitamin C) reacts with 13 according to the equation HO. OH O HO OH Ascorbic acid C6H₂O6 +13+H₂O OH FO +31 + 2H+ OH HO OH Dehydroascorbic acid CHO, Starch is used as an indicator in the reaction. The end point is marked by the appearance of a deep blue starch-iodine complex when the first fraction of a drop of unreacted I remains in the solution. (a) Verify that the structures above have the chemical formulas written beneath them. You must be able to locate every atom in the formula. Use atomic masses from the periodic table on the inside cover of this book to find the formula mass of ascorbic acid. (b) If 29.41 mL of I solution are required to react with 0.197 0 g of pure ascorbic acid, what is the molarity of the I3 solution? (e) A vitamin C tablet containing ascorbic acid plus inert binder was ground to a powder. Then 0.424 2 g was dissolved and titrated by 31.63 mL of I3. Find the weight percent of ascorbic acid in " tablet.

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Exercises
7-A. Ascorbic acid (vitamin C) reacts with 13 according to the
equation
HO.
OH
HO OH
Ascorbic acid
C6H8O6
+13 + H₂O
OH
HO OH
FO +31 + 2H+
OH
Dehydroascorbic acid
CHO,
Starch is used as an indicator in the reaction. The end point is
marked by the appearance of a deep blue starch-iodine complex
when the first fraction of a drop of unreacted I remains in the
solution.
(a) Verify that the struct above have the chemical formulas
written beneath them. You must be able to locate every atom in the
formula. Use atomic masses from the periodic table on the inside
cover of this book to find the formula mass of ascorbic acid.
(b) If 29.41 mL of I5 solution are required to react with 0.197 0 g of
pure ascorbic acid, what is the molarity of the I3 solution?
(e) A vitamin C tablet containing ascorbic acid plus inert binder
was ground to a powder. Then 0.424 2 g was dissolved and titrated
by 31.63 mL of I3. Find the weight percent of ascorbic acid in
tablet.
Transcribed Image Text:Exercises 7-A. Ascorbic acid (vitamin C) reacts with 13 according to the equation HO. OH HO OH Ascorbic acid C6H8O6 +13 + H₂O OH HO OH FO +31 + 2H+ OH Dehydroascorbic acid CHO, Starch is used as an indicator in the reaction. The end point is marked by the appearance of a deep blue starch-iodine complex when the first fraction of a drop of unreacted I remains in the solution. (a) Verify that the struct above have the chemical formulas written beneath them. You must be able to locate every atom in the formula. Use atomic masses from the periodic table on the inside cover of this book to find the formula mass of ascorbic acid. (b) If 29.41 mL of I5 solution are required to react with 0.197 0 g of pure ascorbic acid, what is the molarity of the I3 solution? (e) A vitamin C tablet containing ascorbic acid plus inert binder was ground to a powder. Then 0.424 2 g was dissolved and titrated by 31.63 mL of I3. Find the weight percent of ascorbic acid in tablet.
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