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Selenium (Se) is an important trace element of human nutrition and a crucial cofactor of the enzyme glutathione peroxidase, which plays a key role in the detoxification of xenobiotics in living cells. However, at high concentrations Se is toxic. Selenium in a 10.0 g soil sample is distilled as the tetrabromide, which is collected in aqueous solution where it is hydrolyzed to selenite (SeO32). The SeO32 is determined iodometrically, requiring 4.5 mL of standard sodium thiosulfate for the titration. The thiosulfate concentration is 0.049 mg Na2S2O3/mL. What is the balanced chemical reaction of this titration? What is the concentration of selenium in the soil (in ppm)? Considering that soil selenium levels in excess of 5 µg/g are considered to be toxic to animal life, evaluate your finding. amu(Se) = 78.96 g/mol.

Selenium (Se) is an important trace element of human nutrition and a crucial cofactor of the enzyme glutathione peroxidase, which plays a key role in the detoxification of xenobiotics in living cells. However, at high concentrations Se is toxic. Selenium in a 10.0 g soil sample is distilled as the tetrabromide, which is collected in aqueous solution where it is hydrolyzed to selenite (SeO32). The SeO32 is determined iodometrically, requiring 4.5 mL of standard sodium thiosulfate for the titration. The thiosulfate concentration is 0.049 mg Na2S2O3/mL. What is the balanced chemical reaction of this titration? What is the concentration of selenium in the soil (in ppm)? Considering that soil selenium levels in excess of 5 µg/g are considered to be toxic to animal life, evaluate your finding. amu(Se) = 78.96 g/mol.

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter14: Chemical Equilibrium
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6 Selenium (Se) is an important trace element of human nutrition and a crucial cofactor of the enzyme glutathione peroxidase, which plays a key role in the detoxification of xenobiotics in living cells. However, at high concentrations Se is toxic. Selenium in a 10.0 g soil sample is distilled as the tetrabromide, which is collected in aqueous solution where it is hydrolyzed to selenite (SeO32-). The SeO3²- is determined iodometrically, requiring 4.5 mL of standard sodium thiosulfate for the titration. The thiosulfate concentration is 0.049 mg Na2S₂O3/mL. What is the balanced chemical reaction of this titration? What is the concentration of selenium in the soil (in ppm)? Considering that soil selenium levels in excess of 5 µg/g are considered to be toxic to animal life, evaluate your finding. amu(Se) = 78.96 g/mol. I I I
Transcribed Image Text:6 Selenium (Se) is an important trace element of human nutrition and a crucial cofactor of the enzyme glutathione peroxidase, which plays a key role in the detoxification of xenobiotics in living cells. However, at high concentrations Se is toxic. Selenium in a 10.0 g soil sample is distilled as the tetrabromide, which is collected in aqueous solution where it is hydrolyzed to selenite (SeO32-). The SeO3²- is determined iodometrically, requiring 4.5 mL of standard sodium thiosulfate for the titration. The thiosulfate concentration is 0.049 mg Na2S₂O3/mL. What is the balanced chemical reaction of this titration? What is the concentration of selenium in the soil (in ppm)? Considering that soil selenium levels in excess of 5 µg/g are considered to be toxic to animal life, evaluate your finding. amu(Se) = 78.96 g/mol. I I I
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