A 25.00-mL sample containing Fe3 and Cu2 required 16.06 mL of 0.050 83 M EDTA for
Chapter 11, Problem 11-B(choose chapter or problem)
A 25.00-mL sample containing Fe3 and Cu2 required 16.06 mL of 0.050 83 M EDTA for complete titration. A 50.00-mL sample of the unknown was treated with NH4F to protect the Fe3. Then Cu2 was reduced and masked by thiourea. Addition of 25.00 mL of 0.050 83 M EDTA liberated Fe3 from its fluoride complex to form an EDTA complex. The excess EDTA required 19.77 mL of 0.018 83 M Pb2 to reach a xylenol orange end point. Find [Cu2] in the unknown. 11-C.
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