8. A 25.00 mL sample of unknown containing Fe3+ and Cu2+ required 16.06 mL of 0.

Question

8. A 25.00 mL sample of unknown containing Fe3+ and Cu2+ required 16.06 mL of 0.05083 M EDTA for complete titration. A 50.00 mL sample of the unknown was treated with NH4F to protect the Fe3+. Then the Cu2+ was reduced and masked by addition of thiourea. On addition of 25.00 mL of 0.05083 M EDTA, the Fe3+ was liberated from its fluoride complex and formed an EDTA complex. The excess EDTA required 19.77 mL of 0.01883 M Pb2+ to reach a xylenol orange end point. Find [Cu2+] in the unknown.

(a) 0.001643 M (b) 0.003286 M (c) 0.007320 M (d) 0.01468 M

Explanation / Answer

8. A 25.00 mL sample of unknown containing Fe3+ and Cu2+ required 16.06 mL of 0.

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