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K= α^2 * Cm
α^2 = K/Cm
α^2 = 10^-6 / 0,05 = 0,00002
α = 0,0045
α = [H+]/Cm
[H+] = α * Cm
[H+] = 0,0045 * 0,05 mol/dm3 = 0,000225 mol/dm3
pH = -log0,000225 = 3,65
pH= 3.65