So the question asks - What is molar solubility of AgCl in 0.1M HCl? Ksp = [Ag+][Cl-] ----> Ksp = 1.8x10-10 After setting up the problem we get.... Ksp = (x)(0.1 + x) 1.8x10-10 = (x)(0.1) 1.8x10-9 = (x) So the resulting answer is a Molar Solubility of 1.8x10-9, which to me is less negative than the Ksp, right? So with that being said, because it is less negative, and more positive than the Ksp, does this mean that AgCl will be more easily dissolved in HCl. Because a common ion is present, I would AgCl dissolves less because Cl is already in solution. Anyway, I am a bit confused, maybe I just have things backwards. Please help, thank you very much.