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KCN ⇒ K⁺ + CN⁻
K⁺ + H₂O tdk dapat bereaksi
CN⁻ + H₂O ⇒ HCN + OH⁻
pOH = - log
= - log
= - log
= - log 2 × 10⁻³
= 3 - log 2
pH = 14 - pOH
= 14 - (3 - log2)
= 11 + log 2