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An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for their Cd?+ content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95 °C overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 98.75 mg sample was taken from the approximately 50 g of dry material and dissolved in 100.0 mL of 0.1 M HCI to create a sample solution. Using the method of standard additions, the chemist prepared five standard solutions in 100.0 mL volumetric flasks, each containing 5.00 mL aliquots of the sample solution. Varying amounts of a 75.0 ppb (ug/L) Cd? + standard were added to each of the flasks, which were then brought to volume with 0.1 M HCI. The Cd? + content of the solutions was then analyzed using GFAAS, resulting in the. absorbance data given in the table. Sample Volume (mL) Cd2 + Standard Volume TTI Absorbance (mL) 5.00 0.00 0.080 5.00 2.50 0.119 5.00 5.00 0.163 5.00 7.50 0.200 5.00 10.00 0.241 Determine the amount of Cd? + per gram of dry clam. Express your final result as milligrams of Cd2 + per gram of dry clam. 0.165 mg Cd2+/g clam amount: Incorrect

An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for their Cd?+ content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95 °C overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 98.75 mg sample was taken from the approximately 50 g of dry material and dissolved in 100.0 mL of 0.1 M HCI to create a sample solution. Using the method of standard additions, the chemist prepared five standard solutions in 100.0 mL volumetric flasks, each containing 5.00 mL aliquots of the sample solution. Varying amounts of a 75.0 ppb (ug/L) Cd? + standard were added to each of the flasks, which were then brought to volume with 0.1 M HCI. The Cd? + content of the solutions was then analyzed using GFAAS, resulting in the. absorbance data given in the table. Sample Volume (mL) Cd2 + Standard Volume TTI Absorbance (mL) 5.00 0.00 0.080 5.00 2.50 0.119 5.00 5.00 0.163 5.00 7.50 0.200 5.00 10.00 0.241 Determine the amount of Cd? + per gram of dry clam. Express your final result as milligrams of Cd2 + per gram of dry clam. 0.165 mg Cd2+/g clam amount: Incorrect

Chemistry
Chemistry
10th Edition
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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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for their Cd?+ content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95 °C overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 98.75 mg sample was taken from the approximately 50 g of dry material and dissolved in 100.0 mL of 0.1 M HCI to create a sample solution. Using the method of standard additions, the chemist prepared five standard solutions in 100.0 mL volumetric flasks, each containing 5.00 mL aliquots of the sample solution. Varying amounts of a 75.0 ppb (ug/L) Cd? + standard were added to each of the flasks, which were then brought to volume with 0.1 M HCI. The Cd? + content of the solutions was then analyzed using GFAAS, resulting in the. absorbance data given in the table. TTT Cd2 + Standard Volume Sample Volume (mL) Absorbance (mL) 5.00 0.00 0.080 5.00 2.50 0.119 5.00 5.00 0.163 5.00 7.50 0.200 5.00 10.00 0.241 Determine the amount of Cd? + per gram of dry clam. Express your final result as milligrams of Cd2 + per gram of dry clam. 0.165 mg Cd2+/g clam amount: Incorrect
Transcribed Image Text:An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for their Cd?+ content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95 °C overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 98.75 mg sample was taken from the approximately 50 g of dry material and dissolved in 100.0 mL of 0.1 M HCI to create a sample solution. Using the method of standard additions, the chemist prepared five standard solutions in 100.0 mL volumetric flasks, each containing 5.00 mL aliquots of the sample solution. Varying amounts of a 75.0 ppb (ug/L) Cd? + standard were added to each of the flasks, which were then brought to volume with 0.1 M HCI. The Cd? + content of the solutions was then analyzed using GFAAS, resulting in the. absorbance data given in the table. TTT Cd2 + Standard Volume Sample Volume (mL) Absorbance (mL) 5.00 0.00 0.080 5.00 2.50 0.119 5.00 5.00 0.163 5.00 7.50 0.200 5.00 10.00 0.241 Determine the amount of Cd? + per gram of dry clam. Express your final result as milligrams of Cd2 + per gram of dry clam. 0.165 mg Cd2+/g clam amount: Incorrect
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