Answers by visitors named: Mendi

I think that your concentrations of Pb and Cl are lower than you think they are. If you were to add 1L of 1M Pb+ to 1L of 1M Cl-, remember that you now have doubled the amount of liquid. You now have 2 L of liquid with 1 mole of Pb+ and 1 mole of Cl- in it. As you add your Cl-,the value gets squared, so, you will eventually get to a point where it puts you over your needed Ksp.