100 ml of 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 mass of PbC₂O₄ precipitated before Mg²⁺begins to precipitate?K_sp (MgC₂O₄) = 8.5 x 10^-5 K_sp (PbC₂O₄) = 2.7 x 10^-11

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Pb²⁺concentration drops from 0.2 M to 6.3x10^-8M; essentially all of the Pb²⁺is precipitated before magnesium oxalate begins to precipitate.

100 Ml of Aqueous Solution Is 0