The precipitation of aluminum hydroxide aloh3 ksp 13 x, Ask an Expert

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The precipitation of aluminum hydroxide, Al(OH)3 (Ksp = 1.3 x 10^-33). is sometimes used to purify water.?
At what pH will precipitation of Al(OH)3 begin if 5.40 lb of aluminum sulfate, Al2(SO4)3, is added to 1150 gallons of water (with a negligible change in volume)?

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