An aqueous solution is 0.2 M in both Mg²⁺ and Pb²⁺ ions. You wish to separate the two metal ions by adding oxalate, C₂O₄^2-. What is the concentration of lead when Mg²⁺begins to precipitate?K_sp (MgC₂O₄) = 8.5 x 10^-5 K_sp (PbC₂O₄) = 2.7 x 10^-11

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Student must first determine concentration of C₂O₄^2- required for 0.2 M Mg²⁺to ppt, using this value determine concentration of Pb²⁺in solution.

An Aqueous Solution Is 0