APFIVE Error Analysis in a Redox Titration
In a redox titration experiment to determine the concentration of an unknown Fe2+ solution, a student uses potassium dichromate (K2Cr2O7) as the titrant. The endpoint is identified by the formation of a green Cr3+ solution. However, the student consistently obtains a lower concentration of Fe2+ than expected. The student ensures the use of a standardized K2Cr2O7 solution and correct stoichiometry. What was the conceptual mistake?
A
Incorrectly calculated the endpoint volume
B
Used an inappropriate indicator for the titration
C
Neglected the effect of ambient light on the reaction
D
Failed to account for the oxidation of Fe2+ to Fe3+
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