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A 0.4569 g sample of pewter, containing tin, lead, copper, and zinc, was dissolved in acid....

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Chemistry

A 0.4569 g sample of pewter, containing tin, lead, copper, andzinc, was dissolved in acid. Tin was precipitated as SnO2·4H2O andremoved by filtration. The resulting filtrate and washings werediluted to a total volume of 250.0 mL. A 20.00 mL aliquot of thissolution was buffered, and titration of the lead, copper, and zincin solution required 34.02 mL of 0.001513 M EDTA. Thiosulfate wasused to mask the copper in a second 25.00 mL aliquot. Titration ofthe lead and zinc in this aliquot required 34.42 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 25.92 mL of the EDTA solution. Determine the percentcomposition by mass of each metal in the pewter sample.

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