Copper is known to be toxic to fish, and in particular, the Cu²+ species shows greatest toxicity. a. Calculate the speciation of Cu(II) for freshwater at a pH value of 8.3 as the hardness increases from 20 (soft) to 100 (moderately hard) to 200 (very hard) mg / L as CaCO3. Assume that the total divalent Cu(II) concentration is 10 µg / L. b. Based on your findings in part (a), do you think it is appropriate to set a single regulatory limit or should it depend on variables such as pH and hardness? Explain your answer.

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Chapter1: Chemical Foundations
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Copper is known to be toxic to fish, and in particular, the Cu²+ species shows greatest
toxicity.
a. Calculate the speciation of Cu(II) for freshwater at a pH value of 8.3 as the hardness
increases from 20 (soft) to 100 (moderately hard) to 200 (very hard) mg / L as
CaCO3. Assume that the total divalent Cu(II) concentration is 10 µg / L.
b. Based on your findings in part (a), do you think it is appropriate to set a single
regulatory limit or should it depend on variables such as pH and hardness? Explain
your answer.
Transcribed Image Text:2+ Copper is known to be toxic to fish, and in particular, the Cu²+ species shows greatest toxicity. a. Calculate the speciation of Cu(II) for freshwater at a pH value of 8.3 as the hardness increases from 20 (soft) to 100 (moderately hard) to 200 (very hard) mg / L as CaCO3. Assume that the total divalent Cu(II) concentration is 10 µg / L. b. Based on your findings in part (a), do you think it is appropriate to set a single regulatory limit or should it depend on variables such as pH and hardness? Explain your answer.
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