A 125 mL sample of orange juice was titrated using a redox reaction to the equivalence point with the addition of 7.6 mL of a 0.0025M iodine (I₂) solution. What is the concentration of vitamin C (C₆H₈O₆) in this sample?
C₆H₈O₆(aq) + I₂(aq) $\rightarrow$ C₆H₆O₆(aq) + 2I^-(aq) + 2H⁺(aq)

Question

A 125 mL sample of orange juice was titrated using a redox reaction to the equivalence point with the addition of 7.6 mL of a 0.0025M iodine (I₂) solution. What is the concentration of vitamin C (C₆H₈O₆) in this sample?
C₆H₈O₆(aq) + I₂(aq)

\rightarrow

C₆H₆O₆(aq) + 2I^-(aq) + 2H⁺(aq)

Quizplus · Accepted Answer

The moles of iodine used are 7.6 mL * 0.0025 M = 0.000019 mol. Since the reaction is 1:1, the moles of vitamin C are also 0.000019 mol. The concentration of vitamin C is 0.000019 mol / 0.125 L = 0.000152 M or 0.15 mM.

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