The precipitation of Al(OH)3 (Ksp = 1.3 × 10-33) is sometimes used to purify water. (a) Estimate the pH at which precipitation of Al(OH)3 will begin if 5.0 lb of Al2(SO4)3 is added to 2000 gal of water.
(b) Approximately how many pounds of CaO must be added to the water to achieve this pH?
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