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    Determine Minimum pH for Precipitate Formation

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    What is the minimum pH at which aluminum hydroxide,
    Al(OH)3 will precipitate from a 0.020 M Al(NO3)3 solution. Consider activity effects.
    The Ksp for Al(OH)3 is 3x10^(-34).
    Assume the pH can be changed without increasing the solution volume.

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    Solution Preview

    Al(OH)3 = (Al+++) + 3(OH-)
    Ksp of Al(OH)3 = 3*10^(-34) < [Al+++]*[OH-] => for ...

    Solution Summary

    The solution explains, through calculations, how to determine the minimum pH for precipitate formation.