Ascorbic acid (vitamin C, page 354) reacts with I 3 according to the equation Ascorbic
Chapter 1, Problem 1-D(choose chapter or problem)
Ascorbic acid (vitamin C, page 354) reacts with I 3 according to the equation Ascorbic acid I3 H2O S dehydroascorbic acid 3I 2H Starch is used as an indicator in the reaction. The end point is markedby the appearance of a deep blue starch-iodine complex when the first fraction of a drop of unreacted I 3 remains in the solution. (a) Use atomic masses from the periodic table on the inside cover of this book to find the formula mass of ascorbic acid. Ex (b) If 29.41 mL of solution are required to react with 0.197 0 g of pure ascorbic acid, what is the molarity of the solution? (c) A vitamin C tablet containing ascorbic acid plus inert binder was ground to a powder, and 0.424 2 g was titrated by 31.63 mL of . Find the weight percent of ascorbic acid in the tablet.
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