A lake water is analyzed and found to have 1.2 mg NH4*/L, at pH = 7.8. a. Using pKa and ionization fraction values (ao and a1), determine the fractions of NH4* and NH3 forms. b. Use this information, combined with the ammonium (NH4*) concentration above, to estimate the concentration of ammonia (NH3) in the lake in units of mg/L. c. The 96-hour median lethal concentration (LC50) for ammonia (NH3) for trout ranges from 0.16-1.1 mg/L. What pH would the water in the lake need to increase to, in order to reach the 0.16 mg/L threshold?

A lake water is analyzed and found to have 1.2 mg NH4/L, at pH = 7.8. a. Using pKa and ionization fraction values (ao and a1), determine the fractions of NH4 and NH3 forms. b. Use this information, combined with the ammonium (NH4*) concentration above, to estimate the concentration of ammonia (NH3) in the lake in units of mg/L. c. The 96-hour median lethal concentration (LC50) for ammonia (NH3) for trout ranges from 0.16-1.1 mg/L. What pH would the water in the lake need to increase to, in order to reach the 0.16 mg/L threshold?

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

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

V. A lake water is analyzed and found to have 1.2 mg NH4*/L, at pH = 7.8.
a. Using pKa and ionization fraction values (ao and a1), determine the fractions of NH4* and
NH3 forms.
b. Use this information, combined with the ammonium (NH4*) concentration above, to
estimate the concentration of ammonia (NH3) in the lake in units of mg/L.
c. The 96-hour median lethal concentration (LC50) for ammonia (NH3) for trout ranges from
0.16-1.1 mg/L. What pH would the water in the lake need to increase to, in order to
reach the 0.16 mg/L threshold?

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