The Graph Below Shows the Redox Titration Curve of a 0.05

The graph below shows the redox titration curve of a 0.05 M Sn²⁺ solution titrated with 0.1 M Ce⁴⁺. The equivalence point indicates the volume of 0.1 M Ce⁴⁺ required to fully oxidize all of the Sn²⁺ in solution.  If more than 100 mL of 0.1 M Ce⁴⁺ is required to titrate an equal volume of another 0.05 M Sn²⁺ solution, which of the following could be used to explain the inaccurate equivalence point?

A) The volume of the Sn²⁺ solution has increased.
B) The concentration of Sn²⁺ in solution has increased.
C) An impurity that can oxidize Ce³⁺ back to Ce⁴⁺ is present in the Sn²⁺ solution.
D) A metal salt impurity that can also be oxidized by Ce⁴⁺ is present in the Sn²⁺ solution.

Correct Answer:

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