Need to precipitate lead from a concentrated calcium chloride solution w/o precipitating out the calcium.  Hydroxide addition (to form lead hydroxide) causes CaO to form and precipitate.  NaSH addition (to form a lead sulfide) is useful, but has some odor problems, and the possibility of forming H2S.

Any other suggestions?

Check your solubility rules.  

Wait, so you're saying you have a concentrated CaCl2 solution WITH lead ions in it??  That sounds kind of wacky to me.

Ok let's say then it's a solution with Ca2+, Cl-, and Pb2+.

Add NaI to the solution, CaI2 is soluble and PbI2 will precipitate bright yellow.

Edit**:  But if those three initial ions were already in solution then the Pb2+ would have already reacted with the Cl- to form a precipitate.  

Hm, I guess I don't really understand the question then?  

I do now.  

For the Ksp values do you have to just remember them like molar masses or is there another way?