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[OH-]= 10^-4
Zn(OH)2 ---> Zn + 2OH
s 2s --> kan Konsentrasi OH- = 10^-4
jadi, 2s = 10^-4 ..
s = 0,5 x 10^-4 --> 5x10^-5
---> Ksp = 4s³
= 4.(5x10^-5)³
= 4.(125 x 10^-15)
=500x10^-15
Ksp = 5 x 10^-13 (a)