Solve and complete the solution: A 25.00-ml sample of unknown containing Fe+3 and Cu+2 required 16.06 ml of 0.05038 M EDTA for complete titration. A 25.00-ml sample of the unknown was treated with NH4F to protect the Fe+3. Then the Cu+2 was reduced and masked by addition of thiourea. Upon addition of 13.00 ml of 0.05038 M EDTA, the Fe+3 was liberated from its fluoride complex and formed an EDTA complex. The excess EDTA required 10.00 ml of 0.01833 M Pb+2 to reach an end point, using xylenol orange. Find the concentration of Cu+2 in the unknown.

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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A 25.00-ml sample of unknown containing Fe⁺³ and Cu⁺² required 16.06 ml of 0.05038 M EDTA for complete titration. A 25.00-ml sample of the unknown was treated with NH₄F to protect the Fe⁺³. Then the Cu⁺² was reduced and masked by addition of thiourea. Upon addition of 13.00 ml of 0.05038 M EDTA, the Fe⁺³ was liberated from its fluoride complex and formed an EDTA complex. The excess EDTA required 10.00 ml of 0.01833 M Pb⁺² to reach an end point, using xylenol orange. Find the concentration of Cu⁺² in the unknown.

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