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x x x
0,1. 0,1. 0,1
Mg(OH)2 --> Mg2+ + 2OH-
ksp = [Mg][OH]²
1,8 x 10^-11 = x . 0,1²
x = 1,8 x 10^-11 / 10-²
x= 1,8 x 10^-9 mol/L