Error Analysis in a Redox Titration
In a redox titration to determine the concentration of an Fe²⁺ solution, a student uses standardized K₂Cr₂O₇ as the titrant. The endpoint is identified by the appearance of green Cr³⁺ ions. The student’s calculated Fe²⁺ concentration is consistently lower than the expected value. Assuming the use of a correctly standardized titrant and proper stoichiometric calculations, which of the following is the most probable cause of this error?
A
Failed to account for the oxidation of Fe2+ to Fe3+
B
Incorrectly calculated the endpoint volume
C
Used an inappropriate indicator for the titration
D
Neglected the effect of ambient light on the reaction
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