A saturated solution of lead(II) iodide, PbI_2 has an iodide concentration of 3.0 times 10^-3 mol/L(see photo). a. What is the molar solubility of PbI_2.? b. Determine the solubility constant, K_sp, for lead(II) iodide. c. Does the molar solubility of lead(II) iodide increase, decrease, or remain unchanged with the addition of potassium iodide to the solution? Explain.