4. The molar solubility of lead(II) iodide in water at 0°C is 9.54 x 104 mol/L. What is the solubility product constant, Ksp, for lead(II) iodide at the same temperature?

a. 9.54 x 10^-4 b. 1.82 x 10^-6 c. 9.10 x 10^-7 d. 3.48 x 10^-9