The precipitation of aluminum hydroxide, Al(OH)3 (Ksp = 1.3 x 10-33), is sometimes used to purify water. The Ksp can be used to

Question

The precipitation of aluminum hydroxide, Al(OH)3 (Ksp = 1.3 x 10-33), is sometimes used to purify water.
The Ksp can be used to find the concentration of hydroxide ions, and thus determine the pH given a concentration of of aluminum. At what pH will precipitation of Al(OH)3 begin if 4.90 lb of aluminum sulfate, Al2(SO4)3, is added to 1150 gallons of water (with a negligible change in volume)?
Express your answer numerically to two decimal places.

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