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senyawa Ba(OH)2 memiliki 2 ion OH-, sehingga memiliki valensi 2.
[OH-] = 0,1 M x 2
[OH-] = 0,2 M
mol [OH-] = [OH-] x volume
mol [OH-] = 0,2 x 0,05 liter
mol [OH-] = 0,01 mol (B)