Jawabanmu

2014-04-11T08:29:14+07:00
Koreksi lagi tuh soal !!!

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