Iron in the Form FeCl₂ Can Be Determined by Titration

question 50

Multiple Choice

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

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