Find the Ksp range for PbI2(s) (hint: you will need to apply the dilution formula to the concentration of Pb(NO3)2 and KI. Think about what you will need to find the Ksp and look for those pieces of information in the video. You are looking for a range so you need to find the Ksp of the first test tube that did not have precipitate and the last test tube that had precipitate.