(a) The aqueous solubility of lead (II) iodide is 0.54 grams/100 ml solution at 25 C. Find the Ksp of lead (II) iodide at 25C. (b) In a gravimetric analysis, the content of iron in a carbonate sample is analyzed based on the following chemical reactions. FeCO3+2NaOH 4Fe(OH)2+O2 Fe(OH)2+Na2CO3 2Fe2O3+4H20 If the mass of the final iron (III) oxide formed is 0.35g, calculate the mass of Fe contained in the carbonate sample. (c) The pH of a 0.35 M carboxylic acid is 4.5, calculate its pK, value