Question- Kidney stones often contain insoluble calcium oxalate, CaC2O4, which has Ksp= 2.3e-9. Calcium oxalate is considerably less soluble than MgC2O4, which has Ksp= 8.6e5. Suppose a solution contained both Ca2+ and Mg2+ at a concentration of 0.28 M. What pH would be required to achieve maximum separation of these ions by precipitation of CaC2O4 if the solution also contains oxalic acid, H2C2O4, at a concentration of 0.16 M? For H2C2O4, Ka1=5.6e-2 and Ka2=5.4e-5
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