Short Answer
An aqueous solution is 0.2 M in both Mg2+ and Pb2+ ions. You wish to separate the two metal ions by adding oxalate, C2O42-. What is the concentration of lead when Mg2+ begins to precipitate?Ksp (MgC2O4) = 8.5 x 10-5 Ksp (PbC2O4) = 2.7 x 10-11
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