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: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter15: Complex Ion And Precipitation Equilibria
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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.
Transcribed Image Text: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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