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Children's toys and jewelry were assessed for their contamination by potentially toxic elements (PTE). This includes traces of As (74.92 g/mol), Cd (112.4 g/mol), Pb (207.2 g/mol), and Zn (65.39 g/mol) among others. The concentrations of these PTES were determined to characterize the subsequent health risks, and to possibly reinforce better legislation on the manufacturing of these products. A. If 365 ppb of Cd was observed, what is its equivalent in %(w/w)? B. A sample of plastic toy was treated resulting to a 1000 mL solution. What is the concentration of As in ppm if 65 ug of As is found in the sample? C. A 250 mL stock solution of 1.5 M Pb standard was prepared. What volume (in mL) of of 0 15 M Ph colution?

Children's toys and jewelry were assessed for their contamination by potentially toxic elements (PTE). This includes traces of As (74.92 g/mol), Cd (112.4 g/mol), Pb (207.2 g/mol), and Zn (65.39 g/mol) among others. The concentrations of these PTES were determined to characterize the subsequent health risks, and to possibly reinforce better legislation on the manufacturing of these products. A. If 365 ppb of Cd was observed, what is its equivalent in %(w/w)? B. A sample of plastic toy was treated resulting to a 1000 mL solution. What is the concentration of As in ppm if 65 ug of As is found in the sample? C. A 250 mL stock solution of 1.5 M Pb standard was prepared. What volume (in mL) of of 0 15 M Ph colution?

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter2: Chemical Compounds
Section: Chapter Questions
Problem 138QRT: An adult human body contains 6.0 L blood, which contains about 15.5 g hemoglobin per 100.0 mL blood....
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Concentration of Solutions Children's toys and jewelry were assessed for their contamination by potentially toxic elements (PTE). This includes traces of As (74.92 g/mol), Cd (112.4 g/mol), Pb (207.2 g/mol), and Zn (65.39 g/mol) among others. The concentrations of these PTES were determined to characterize the subsequent health risks, and to possibly reinforce better legislation on the manufacturing of these products. A. If 365 ppb of Cd was observed, what is its equivalent in %(w/w)? B. A sample of plastic toy was treated resulting to a 1000 mL solution. What is the concentration of As in ppm if 65 µg of As is found in the sample? C. A 250 mL stock solution of 1.5 M Pb standard was prepared. What volume (in mL) of Pb stock solution must you use to prepare 50 mL of 0.15 M Pb solution? D. If the treatment used HNO3 (p = 1.51 g/mL) as the solvent during dissolution, and %3D the density of Zn is 7.1 g/mL, what is the concentration of Zn in molality if the amount of Cd found in a 250 mL solution was 48 mg?
Transcribed Image Text:Concentration of Solutions Children's toys and jewelry were assessed for their contamination by potentially toxic elements (PTE). This includes traces of As (74.92 g/mol), Cd (112.4 g/mol), Pb (207.2 g/mol), and Zn (65.39 g/mol) among others. The concentrations of these PTES were determined to characterize the subsequent health risks, and to possibly reinforce better legislation on the manufacturing of these products. A. If 365 ppb of Cd was observed, what is its equivalent in %(w/w)? B. A sample of plastic toy was treated resulting to a 1000 mL solution. What is the concentration of As in ppm if 65 µg of As is found in the sample? C. A 250 mL stock solution of 1.5 M Pb standard was prepared. What volume (in mL) of Pb stock solution must you use to prepare 50 mL of 0.15 M Pb solution? D. If the treatment used HNO3 (p = 1.51 g/mL) as the solvent during dissolution, and %3D the density of Zn is 7.1 g/mL, what is the concentration of Zn in molality if the amount of Cd found in a 250 mL solution was 48 mg?
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