Children's toys and jewelry were assessed for their contarmination 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 mLstock 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 0.15MP.
Children's toys and jewelry were assessed for their contarmination 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 mLstock 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 0.15MP.
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 143QRT: The present average concentration (mass percent) of magnesium ions in seawater is 0.13%. A chemistry...
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![Concentration of Solutions
Children's toys and jewelry were assessed for their contarnination 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, whatis 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 Pb stock solution must you useto prepare 50 mLof 0,15 M Pb.
solution?
D. If the treatment used HNO3 (p-1.51 g/nL) as the solvent during dissolution.
land the density of Zn is 7.1 g/mL, what is the concentration of Zn in molality if
the amount of Zn found in a 250 mLsolution was 48 mg?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F77871fdc-5416-4aee-960b-8b3b7a73e4c5%2Fa1d04f57-ad24-4bbb-b6dd-6157a95c941b%2Fzqahvx7_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Concentration of Solutions
Children's toys and jewelry were assessed for their contarnination 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, whatis 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 Pb stock solution must you useto prepare 50 mLof 0,15 M Pb.
solution?
D. If the treatment used HNO3 (p-1.51 g/nL) as the solvent during dissolution.
land the density of Zn is 7.1 g/mL, what is the concentration of Zn in molality if
the amount of Zn found in a 250 mLsolution was 48 mg?
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