Question: A 43.2 -g sample of solid waste is treated with concentrated nitric acid to extract any lead present as Pb2+ ions. Sulphuric acid is then

A 43.2 -g sample of solid waste is treated with concentrated nitric acid to extract any lead present as Pb2+ ions. Sulphuric acid is then added to precipitate all the lead ions as PbSO4(s), which is filtered and dried. If the mass of lead sulphate is 21.56g, calculate the mass percentage of lead in the waste. The molar masses of lead and lead sulphate are 207.20 and 303.27gmol1, respectively. Enter only the numerical answer to the correct number of significant figures. Your Answer: Your

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