Iron in the Form FeCl₂ Can Be Determined by Titration

question 45

Multiple Choice

Iron in the form FeCl₂ can be determined by titration with potassium dichromate:
6 FeCl₂(aq) + K₂Cr₂O₇(aq) + 14 HCl(aq) → 6 FeCl₃(aq) + 2 CrCl₃(aq) + 2 KCl(aq) + 7 H₂O(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

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