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pH = -log [H+]
[H+] - steżenie jonów wodorowych
pH + pOH = 14 => pOH = 14 - pH
1) pH = -log 0,05 = 1,3
pOh = 14 - 1,3 = 12,7
2) pH = -log 3,4*10^-9 = 8,5
pOh = 14 - 8,5 = 5,5