Can someone tell me which is the Ksp equation for Al(OH)3 in water?

[Al3+]3[OH-]
[Al3+]3[OH-]3
[Al3+]3[OH-]2
[Al3+][OH-]3

Answer:
The equilibrium is
Al(OH)3 <> Al3+ + 3OH-
for which the equilibrium requirement is
Ksp = [Al3+] [OH-]^3

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