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Titrimetry

For the determination of the levels of Ascorbic acid (Vitamin C: C6H8O6), in Mazoe orange crush, ascorbic is oxidized using a known amount of I3– to dehydroascorbic acid, C6H6O6, and back titrating the excess I3– with Na2S2O3. A 4.00-mL sample of filtered Mazoe orange crush was treated with 40.00 mL of 0.00823 M I3–. After the oxidation was complete, 11.40 mL of 0.06981 M Na2S2O3 was needed to reach the endpoint.


C6H8O6 (aq)+ I3– (aq)→ I−(aq)+ C6H6O6 (aq)+ H+(aq)

I3−(aq)+ S2O32−(aq)→S4O62−(aq)+ I−(aq)


i)             What is the concentration of ascorbic acid in Mazoe Orange crush in mg/100 mL.


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