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Ammonia, NH3, is toxic to a wide range of aquatic organisms including snails, insects, and fish. The ammonium ion, NH4*, is much less toxic since the cation does not diffuse rapidly across cell membranes. The US EPA limit for total ammonia in natural waters is 1.9 mg/L at pH 7. a. What is this limit in molar units? b. What is the concentration of NH3 at pH 7? c. What is the concentration of NH3 at pH 6? d. Why is the EPA limit for total ammonia dependent on the water pH?

Ammonia, NH3, is toxic to a wide range of aquatic organisms including snails, insects, and fish. The ammonium ion, NH4*, is much less toxic since the cation does not diffuse rapidly across cell membranes. The US EPA limit for total ammonia in natural waters is 1.9 mg/L at pH 7. a. What is this limit in molar units? b. What is the concentration of NH3 at pH 7? c. What is the concentration of NH3 at pH 6? d. Why is the EPA limit for total ammonia dependent on the water pH?

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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3) Ammonia, NH3, is toxic to a wide range of aquatic organisms including snails, insects, and fish. The ammonium ion, NH4", is much less toxic since the cation does not diffuse rapidly across cell membranes. The US EPA limit for total ammonia in natural waters is 1.9 mg/L at pH 7. a. What is this limit in molar units? b. What is the concentration of NH3 at pH 7? c. What is the concentration of NH3 at pH 6? d. Why is the EPA limit for total ammonia dependent on the water pH?
Transcribed Image Text:3) Ammonia, NH3, is toxic to a wide range of aquatic organisms including snails, insects, and fish. The ammonium ion, NH4", is much less toxic since the cation does not diffuse rapidly across cell membranes. The US EPA limit for total ammonia in natural waters is 1.9 mg/L at pH 7. a. What is this limit in molar units? b. What is the concentration of NH3 at pH 7? c. What is the concentration of NH3 at pH 6? d. Why is the EPA limit for total ammonia dependent on the water pH?
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