Iron in the Form FeCl₂ Can Be Determined by Titration

Iron in the form FeCl₂ can be determined by titration with potassium dichromate: 6FeCl₂(aq) + K₂Cr₂O₇(aq) + 14HCl(aq) → 6FeCl₃(aq) + 2CrCl₃(aq) + 2KCl(aq) + 7H₂O(l)
An iron sample of mass 0.800 g required 18.80 mL of 0.0120 M K2Cr₂O₇(aq) to reach the end point. How many moles of FeCl₂ were in the sample?

A) 1.43 × 10^-2 mol
B) 1.35 × 10^-3 mol
C) 3.75 × 10^-5 mol
D) 2.26 × 10^-4 mol
E) 1.13 × 10^-4 mol

Correct Answer:

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