Part A
A solution of Na2CO3 is added dropwise to a solution that contains 1.12×10−2 M Fe2+ and 1.51×10−2 M Cd2+. What concentration of CO32− is need to initiate precipitation? Neglect any volume changes during the addition. Express the molar concentration numerically.
[CO32−] = 1.19×10−12 M; this is the answer that I got for part A
Part B
In the solution from Part A, what will the concentration of CO32− be when Fe2+ begins to precipitate? Express the molar concentration numerically.