tolong dibantu ya pliss

pH = pKw - pOH
9+log3 = 14 - pOH
pOH = 5-log3

pOH- = -log OH-
OH- = 3x10^-5

OH- = v.bs x Mb
3x10^-5 = 3 x Mb
Mb = 10^-5

Al(OH)3 ==> Al3+ + 3OH-
Ksp = s x (3s)^3
Ksp = 27s^4
Ksp = 27(10^-5)^4
Ksp = 27x10^-20
Ksp = 2.1 x 10^-21