Maximizing Precipitation Efficiency: Balancing Common Ions in Ksp Equations

[ReidMerrill]

Homework Statement

Is it possible to precipitate 99.0% of 0.010 M Ce³⁺ by adding oxalate (C₂O₄^2-) without precipitating 0.010 M Ca²⁺
CaC₂O₄ Ksp = 1.3 x 10-8 Ce₂(C2O4)₃ Ksp = 5.9 x 10-30

Homework Equations

1.3x10^-8 = [0.01M][C2O4-]
5.9x10^-30=[0.01M]²[C2O4]³

The Attempt at a Solution

All I've been able to do is set up those Ksp equations but I'm not sure what to do from here

 

[Borek]

What is the concentration of Ce³⁺ after 99% has been removed?

 

[ReidMerrill]

What is the concentration of Ce³⁺ after 99% has been removed?

1x10^-4M presumably considering no volume is given to convert molarity to moles and mass

 

[Borek]

Does this number help in solving the problem further?