A highly acidic (pH<0.5) industrial wastewater has an initial AP* concentration of 10 ppm. An engineer decides that strong base should be added to the wastewater in order to raise the pH so that most of the aluminum will precipitate and be removed from solution. The pertinent solubility reaction from Appendix A of our text is: Al(OH); (s) → A* + 3OH¯ with pK, = 32.9 a. What is the lowest pH needed to precipitate all but 50 ppb of the aluminum from the wastewater? Assume equilibrium conditions can be achieved. b. Suppose the engineer decides that the pH should be raised to 7. What equilibrium concentration of aluminum would be left in solution? Report your answer in ppb and moles per liter.

A highly acidic (pH<0.5) industrial wastewater has an initial AP* concentration of 10 ppm. An engineer decides that strong base should be added to the wastewater in order to raise the pH so that most of the aluminum will precipitate and be removed from solution. The pertinent solubility reaction from Appendix A of our text is: Al(OH); (s) → A* + 3OH¯ with pK, = 32.9 a. What is the lowest pH needed to precipitate all but 50 ppb of the aluminum from the wastewater? Assume equilibrium conditions can be achieved. b. Suppose the engineer decides that the pH should be raised to 7. What equilibrium concentration of aluminum would be left in solution? Report your answer in ppb and moles per liter.

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

Potentiometric Titrations

Potentiometric titration is one of the important titration methods and is mainly carried out to characterize acid solutions. It follows a method similar to that of the normal titration technique, but the main difference is that there is no indicator used in the potentiometric titrations. Instead of using an indicator, electrodes are employed for monitoring the whole titration process. A scientist named Robert Behrend did the potentiometric titration for the first time, and it was done using the mercurous solution and potassium chloride.

Question

A highly acidic (pH<0.5) industrial wastewater has an initial AP* concentration of 10 ppm.
An engineer decides that strong base should be added to the wastewater in order to raise the pH so that
most of the aluminum will precipitate and be removed from solution. The pertinent solubility reaction
from Appendix A of our text is:
Al(OH); (s) → A* + 3OH¯ with pK, = 32.9
a. What is the lowest pH needed to precipitate all but 50 ppb of the aluminum from the
wastewater? Assume equilibrium conditions can be achieved.
b. Suppose the engineer decides that the pH should be raised to 7. What equilibrium
concentration of aluminum would be left in solution? Report your answer in ppb and moles
per liter.

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