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C(Al3+) [C(OH-)]^3 = Ksp
C(OH-) = [Ksp / C(Al3+) ]^1/3
            = [1.3*10^-33 /10^-5 ]^1/3
            = 2.35*10^-9
pH = 14 - pOH = 14 - (- lg 2.35*10^-9) = 5.37
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