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4. It has been reported that Americans ingest a total of approximately 8 tons/day of lead. The drinking water standard for lead is 0.05 mg/L total soluble lead. One method for removing heavy metals such as lead is pH adjustment to precipitate the metal hydroxide. Consider the reactions governing the solubility of lead hydroxide in pure water: Pb(OH)2(s) Pb2+ + 2OH Kso=10-15.6 Pb2+ + OH +POH Pb2+ + 2OH +Pb(OH)2 Pb2+ + 30H +Pb(OH)3 Bi=1063 B2=10109 Bz=1013.9 a) Construct a logC-pH diagram for the Pb(OH)2(s) system. Indicate the region of Pb(OH)2 supersaturation by shading the appropriate portion of the diagram. b) What is the lowest possible lead concentration (in mg/L as Pb) that could be attained by precipitating Pb(OH)2(s)? At what pH would the precipitation need to be carried out to achieve this level