A 50.0-mL solution containing Ni21 and Zn21 was treated with 25.0 mL of 0.045 2 M EDTA to bind all the metal. The excess unreacted EDTA required 12.4 mL of 0.012 3 M Mg21 for complete reaction. An excess of the reagent2,3-dimercapto-1-propanol was then added to displace the EDTA from zinc. Another 29.2 mL of Mg21 were required for reaction with the liberated EDTA. Calculate the molarities of Ni21 and Zn21 in the original solution.

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