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= 2 . 0,2
= 0,4 M (D)
29. [OH-] = Vb.Mb
= 1.0,1
= 0,1 (b)
30. [OH-] = b x Mb
= 2 x 2 x 10^-1
= 4 x 10^-1
= 0,4 M