Question: Ascorbic acid, C6H8O6 (vitamin C), is a reducing agent. The amount of this acid in solution can be determined quantitatively by a titration procedure involving

Ascorbic acid, C6H8O6 (vitamin C), is a reducing agent. The amount of this acid in solution can be determined quantitatively by a titration procedure involving iodine, I2, in which ascorbic acid is oxidized to dehydroascorbic acid, C6H6O6.
C6H8O6(aq) + I2(aq) → C6H6O6(aq) + 2HI(aq)
A 30.0-g sample of an orange-flavored beverage mix was placed in a flask to which 10.00 mL of 0.0500 M KIO3 and excess KI were added. The IO3 and I ions react in acid solution to give I2, which then reacts with ascorbic acid. Excess iodine is titrated with sodium thiosulfate. If 31.2 mL of 0.0300 M Na2S2O3 is required to titrate the excess I2, how many grams of ascorbic acid are there in 100.0 g of beverage mix?

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