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{"ops":[{"insert":"A 1.509-g sample of a Pb\/Cd alloy was dissolved in acid and diluted to exactly 250.0 mL in\u00a0\na volumetric flask. A 50.00-mL aliquot of the diluted solution was brought to a pH of 10.0 with a\u00a0\nNH3+?NH3 buffer; the subsequent titration involved both cations and required 28.89 mL of 0.06990 M\u00a0\nEDTA. A second 50.00-mL aliquot was brought to a pH of 10.0 with an HCN\/NaCN buffer, which also\u00a0\nserved to mask the Cd\u00b2+; 11.56 mL of the EDTA solution were needed to titrate the Pb\u00b2\u201c. Calculate\u00a0\nthe percent Pb and Cd in the sample.\n"}]}
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