I'm kinda desperate here, I could really use some help.
Magnesium oxalate has a Ksp of 8.6x10-5, and the calcium one has a Ksp of 2.3x 10-9. What pH must be maintained to achieve the maximum separation of the calcium ion from the magnesium ion, if both have a concentration of 0.1 mol/L, and the concentration of oxalic acid is maintained at 0.1 mol/L?
Data: For oxalic acid: Ka1 = 6.5x 10-2, Ka2 = 6.1x10 -5
Well, I have tried to calculate the molar concentration of C2O42- using the ksp equation of MgC2O4, let´s name it y.
h2c2o4--->2h+ + c2o42- K=Ka1.Ka2
? 0 Y
-X +2X +X
0,1 2X Y+X
I'm not sure if what I did gives the maximum separation, any suggestions?