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pOH = 4 - log 5
[OH] = 5 . 10⁻⁴
maka,
[OH⁻] = √Kb.M
5 . 10⁻⁴ = √2,5 x 10⁻⁵. M --> kuadratkan
25 . 10⁻⁸ = 2,5 x 10⁻⁵. M
M = 25 . 10⁻⁸ / 2,5 x 10⁻⁵
M = 10⁻² --> 0,01 M