Answer to Question #285686 in Chemistry for neg

Question

A 1.509-g sample of a Pb/Cd alloy was dissolved in acid and diluted to exactly 250.0 mL in 

a volumetric flask. A 50.00-mL aliquot of the diluted solution was brought to a pH of 10.0 with a 

NH3+?NH3 buffer; the subsequent titration involved both cations and required 28.89 mL of 0.06990 M 

EDTA. A second 50.00-mL aliquot was brought to a pH of 10.0 with an HCN/NaCN buffer, which also 

served to mask the Cd²+; 11.56 mL of the EDTA solution were needed to titrate the Pb²“. Calculate 

the percent Pb and Cd in the sample.

Answer 1

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