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To remove excess hydroxide ion from treated water some municipalities add aluminum sulfate. The aluminum ion reacts with the hydroxide ion to form a precipitate

To remove excess hydroxide ion from treated water some municipalities add aluminum sulfate. The aluminum ion reacts with the hydroxide ion to form a precipitate of aluminum hydroxide. Calculate the concentration of aluminum ion required to just begin the precipitation of aluminum hydroxide in a solution that has a hydroxide concentration of 1.0 x 10-5 M. (K = 1.3 x 10-33)

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