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A 50.0 mL sample containing Cd2+ and Mn2+ was treated with 42.5 mL of 0.0700 M...

A 50.0 mL sample containing Cd2+ and Mn2+ was treated with 42.5 mL of 0.0700 M EDTA. Titration of the excess unreacted EDTA required 16.8 mL of 0.0120 M Ca2+. The Cd2+ was displaced from EDTA by the addition of an excess of CN–. Titration of the newly freed EDTA required 26.9 mL of 0.0120 M Ca2+. What were the molarities of Cd2+ and Mn2+ in the original solution?

Answer: ([Cd2+] = 0.00646 M; and [Mn2+] = 0.0490 M)

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