A water sample known to contain lead (MM: 207.2) and silver (MM: 107.9) was analyzed to determine its lead and silver content. A 10.00-mL aliquot (portion) of the water sample was chemically treated to convert all lead to Pb2* and silver to Ag* then added with slight excess of HCI to precipitate them as chlorides (MM PbCI2: 278.1; AgCI: 143.3). After thorough washing and drying, 0.0620 g of the precipitate was recovered. Simultaneously, another 10.00-mL portion of the water sample was subjected to electrogravimetry. Lead was deposited as PO (MM: 223.2) while silver was deposited as metal on the surface of a platinum electrode. The deposited material weighed 0.0467 g. Calculate %Pb and %Ag (by volume) in the water sample.
A water sample known to contain lead (MM: 207.2) and silver (MM: 107.9) was analyzed to determine its lead and silver content. A 10.00-mL aliquot (portion) of the water sample was chemically treated to convert all lead to Pb2* and silver to Ag* then added with slight excess of HCI to precipitate them as chlorides (MM PbCI2: 278.1; AgCI: 143.3). After thorough washing and drying, 0.0620 g of the precipitate was recovered. Simultaneously, another 10.00-mL portion of the water sample was subjected to electrogravimetry. Lead was deposited as PO (MM: 223.2) while silver was deposited as metal on the surface of a platinum electrode. The deposited material weighed 0.0467 g. Calculate %Pb and %Ag (by volume) in the water sample.
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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A water sample known to contain lead (MM: 207.2) and silver (MM: 107.9) was analyzed to determine its lead and silver content.
A 10.00-mL aliquot (portion) of the water sample was chemically treated to convert all lead to Pb2* and silver to Ag* then added with slight
excess of HCI to precipitate them as chlorides (MM PbCI2: 278.1; AgCI: 143.3). After thorough washing and drying, 0.0620 g of the
precipitate was recovered.
Simultaneously, another 10.00-mL portion of the water sample was subjected to electrogravimetry. Lead was deposited as PO (MM:
223.2) while silver was deposited as metal on the surface of a platinum electrode. The deposited material weighed 0.0467 g. Calculate %Pb
and %Ag (by volume) in the water sample.
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