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A 0.4494 g sample of pewter, containing tin, lead, copper, and zinc, was dissolved in acid. Tin was precipitated as Sno, . 4 H, O and removed by filtration. The resulting filtrate and washings were diluted to a total volume of 200.0 mL. A 15.00 mL aliquot of this solution was buffered, and titration of the lead, copper, and zinc in solution required 35.07 mL of 0.001463 M EDTA. Thiosulfate was used to mask the copper in a second 20.00 mL aliquot. Titration of the lead and zinc in this aliquot required 34.08 mL of the 0.001463 M EDTA solution. Finally, cyanide was used to mask the copper and the zinc in a third 25.00 mL aliquot. Titration of the lead in this aliquot required 26.37 mL of the 0.001463 M EDTA solution. Determine the percent composition by mass of each metal in the pewter sample. Cu : % Zn : % Pb : % Sn : %