Determining the ksp of calcium hydroxide pre lab questions determine the ksp of calcium fluoride (caf2), given a molar solubility of 4.58 x 105 mol/l 1. 2. determine the molar solubility of potassium chromate (kacro4) given a ksp of 142. 3. when a common ion is introduced, should the molar solubility of a molecule increase, or decrease? why? discussion questions 1. based on your results, could you predict the solubility of a calcium hydroxide solution following the addition of a known amount of calcium chloride? why or why nota what other factors besides a common ion, can affect solubility? design an experiment to determine molar solubility that involves changing a different variable. 2.