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PH=9,POH=14-9=5,OH-=10^-5
M(OH)2---->M2++2OH-
10^-5 10^-5 2.10^-5
Ksp=(M2+)(OH-)^2
=(10^-5)(2.10^-5)^2
=(10^-5)(4.10^-10)
=4.10^-15
Cara2 :
M(OH)2---->M2++2OH-
s ( 2s)^2=4s^3
maka ksp=4s^3
=4(10^-5)^3=4.10^-15
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