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{"ops":[{"insert":"\u00a0A 25.ID-mL sample containing Fe\u00b3\u00b0\u00a0and Cu\u00b0\u00b0 required\n16.06 mL of 0.050 83 M EDTA for complete titration. A 50.IXI-mL sample of the unknown was treated\u00a0\nwith NH F to protect the Fe\u00b0\u00b0. Then Cu\u00b2\u00b0\u00a0was reduced and masked by thiourea. Addition of\n25.00 mL of 0.050 83 M EDTA liberated Fe\u00a0\u00a0from its fluoride complex to form an EDTA complex. The\u00a0\nexcess EDTA required\n19.77 mL of 0.018 83 M Pb'+ to reach a xylenol orange end point.\nFind (Cu' ) in the unknown.\n\n"}]}
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