A solution contains $0\mathrm{.}00010$ M copper $($I$)$ ions and $0\mathrm{.}0020$ M lead $($II$)$ ions.

a$.$ What minimal concentration of iodide ions added to the above solution will cause precipitation of

lead $($II$)$ iodide? Ksp$,$ PbI$2=1\mathrm{.}4$ x $10-8$

b$.$ What minimal concentration of iodide ions will cause precipitation of copper $($I$)$ iodide?

Ksp$,$ CuI $=1\mathrm{.}0$ x $10-12$

c$.$ Imagine that you are adding KI solution dropwise to the above solution, which salt will precipitate

first and what will remain in solution?

d$.$ Is KI addition a viable method for separating copper $($I$)$ ions from lead $($II$)$ ion? Explain.