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PH = 11 + log2
POH = 14 - (11 + log2)
POH = 3 - log 2
OH⁻ = 2.10⁻³
[OH⁻] = √Kb.M
(2.10⁻³)² = Kb . 0,2
4.10⁻⁶ = Kb . 0,2
Kb = 4/0,2 . 10⁻⁶ = 2 .10⁻⁷