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* KOH --> K⁺ + OH⁻
₀,₀₀₀₁
[OH⁻] = 0,0001 = 1 × 10⁻⁴
pOH = -log [OH⁻]
= -log 1 × 10⁻⁴
= 4 - log 1
= 4
PH = 14-4 = 10