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Mg(OH)2 > Mg 2+ + 2OH-
[OH-]=b. M
10^-2=2.M
M=10^-2/2
=5.10^-3
M=g/Mr.V
5.10^-3=g/58.10
5.10^-3=g/580
g=5.10^-3.580
=2900.10^-3
=2,9 gram
b=Valensi basa