Answer to Question #285690 in Chemistry for neg

Question

 A 25.ID-mL sample containing Fe³° and Cu°° required

16.06 mL of 0.050 83 M EDTA for complete titration. A 50.IXI-mL sample of the unknown was treated 

with NH F to protect the Fe°°. Then Cu²° was reduced and masked by thiourea. Addition of

25.00 mL of 0.050 83 M EDTA liberated Fe  from its fluoride complex to form an EDTA complex. The 

excess EDTA required

19.77 mL of 0.018 83 M Pb'+ to reach a xylenol orange end point.

Find (Cu' ) in the unknown.

Answer 1

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