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K = 4*10⁻¹⁰
c = 0,01 = 10⁻²
c/K = 4*10⁻⁸ > 400 - można zastosować uproszczone prawo rozcieńczeń Ostwalda:
α = √K/c
α = √4*10⁻⁸ = 2*10⁻⁴
[OH⁻] = α * c
[OH⁻] = 10⁻² * 2 * 10⁻⁴ = 2*10⁻⁶
pH = 14 - pOH = 14 - (-log[OH⁻] = 14 + log[OH⁻]
pH = 14 + (-5,7) = 8,3