a 10 ml sample containing fe3+ and cu2+ was diluted to 100.0 mL solution. A 20 mL aliquot required 25 mL of 0.00500 M EDTA for complete titration. A separate 20 mL aliquot of the diluted sample was treated with NH4F to protect the Fe3+. Then the Cu2+ was treated with thiourea. Upon addition of 25.0 ml of 0.00500 M EDTA, the Fe3+ was liberated from its fluoride complex and formed an EDTA complex. The excess EDTA required 21.5 ml of 0.0180 M Pb2+ to reach an endpoint, using xylenol orange.
a 10 ml sample containing fe3+ and cu2+ was diluted to 100.0 mL solution. A 20 mL aliquot required 25 mL of 0.00500 M EDTA for complete titration. A separate 20 mL aliquot of the diluted sample was treated with NH4F to protect the Fe3+. Then the Cu2+ was treated with thiourea. Upon addition of 25.0 ml of 0.00500 M EDTA, the Fe3+ was liberated from its fluoride complex and formed an EDTA complex. The excess EDTA required 21.5 ml of 0.0180 M Pb2+ to reach an endpoint, using xylenol orange. (a) identify the masking agent (b) identify the auxiliary complexing agent (c) calculate the molar concentration of the fe3+ in the original sample (d) calculate the molar concentration of the cu2+ in the original sample
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