What will the concentration of Cd^2+ be when Fe^2+ begins to precipitate? A solution

What will the concentration of Cd^2+ be when Fe^2+ begins to precipitate?
A solution of Na2CO3 is added dropwise to a solution that contains 1.14×10^-2 M Fe^2+ and 1.50×10^-2 M Cd^2+. What concentration of CO3^2- is need to initiate precipitation? Neglect any volume changes during the addition.
Express the molar concentration numerically.
In the solution from part A, what will the concentration of CO3^2- be when Fe^2+ begins to precipitate?
Express the molar concentration numerically.
Part C
What will the concentration of Cd^2+ be when Fe^2+ begins to precipitate?
Express the molar concentration numerically.
Cd^2+ = .?