A 0.4775 g sample of pewter, containing tin, lead, copper, and zinc, was dissolved in acid....

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A 0.4775 g sample of pewter, containing tin, lead, copper, andzinc, was dissolved in acid. Tin was precipitated as SnO2Â·4H2O andremoved by filtration. The resulting filtrate and washings werediluted to a total volume of 200.0 mL. A 20.00 mL aliquot of thissolution was buffered, and titration of the lead, copper, and zincin solution required 35.98 mL of 0.001455 M EDTA. Thiosulfate wasused to mask the copper in a second 25.00 mL aliquot. Titration ofthe lead and zinc in this aliquot required 34.00 mL of the EDTAsolution. Finally, cyanide was used to mask the copper and the zincin a third 30.00 mL aliquot. Titration of the lead in this aliquotrequired 27.43 mL of the EDTA solution. Determine the percentcomposition by mass of each metal in the pewter sample.

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4.3 Ratings (930 Votes)

Sample weight 04775 g volume of EDTA used for Pb titration 2743 ml moles of EDTA molarity x volume 0001455 x 002743 399 x 105 mols moles of Pb 4 x 105 mols Molarity of Pb 4 x 1050030 002743 695 x 104 M moles of Pb in See Answer

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