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ph= 9
[OH^-]=10^-5
Zn(OH)2 --->Zn^2+ +2OH^-
5.10^-6 5.10^-6 10^-5
ksp = 4s^3
s= 5.10^-6
M=5.10^-6
ms=M.Mr.10
ms=5.10^-6.100.10 =5.10^-3 gram <--
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