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A 50.0 mL sample containing Cd2+ and Mn2+ was treated with 51.7 mL of 0.0500M EDTA. Titration of the excess unreacted EDTA required 15.8 mL of 0.0190 M Ca2+. The Cd2+ was displaced from EDTA by the addition of an excess of CN−. Titration of the newly freed EDTA required 13.7 mL of 0.0190 M Ca2+. What are the concentrations of Cd2+ and A 50.0 mL sample containing Cd2+ and Mn2+ was treated with 51.7 mL of 0.0500 M EDTA. Titration of the excess unreacted EDTA rMn2+ in the original solution?

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Answer #1

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EDTA reacts with metal ions in a 1: 1 mole ratio. That is 1 mole of EDTA reacts with mole of metal ion.

Total no.of moles of EDTA added, n=51. 7 mL x 0.0500 M=2.585 m.mol Consumed amount of EDTA= 15.8 mL x 0.0190 M=0.3002 m.mol 2

concentration: 0.04051 concentration: M Cd2+ 0.005206


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