diketahui nilai ksp AL(OH)3=8,5x10^-23 berapakah kelarutan AL(OH)3 dalam larutan dengan ph=12??

Al(OH)3 => Al^3+ + 3OH-
Ksp = [Al3+] [OH-]^3
pH = 12; pOH = 2; [OH-] = 10^-2
8,5 x 10^-23 = [Al3+] (10^-2)^3
[Al3+] = 8,5 x 10^-17 mol/L
Kelarutan Al(OH)3 ~ kelarutan Al3+ ~ 8,5 x 10^-17 mol/L