A 5.5984 g sample of soil was analyzed for lead. The sample wasdigested in hot perchloric acid for 5 hours, cooled, filtered toremove insoluble silicates, transferred to a 250-ml volumetricflask and diluted to the mark with distilled water. A 50.00-mlportion of the resulting solution was treated with phosphoric acid(H3PO4) forming 0.0862 g of precipitate. Whatwas the weight % of lead?
                 3 Pb2+ + 2 PO43- ®Pb3(PO4)2(s)
