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Ka = 0,00045
Ka = Alfa^2 * C0 / C0
Alfa^2 = Ka / C0
Alfa^2 = 0,00045 / 0,5
Alfa^2 = 0,0009
Alfa = Pierwiastek z 0,0009
Alfa = 0,03
%Alfa = 0,03 * 100% = 3%
%Alfa = 3%
pH = -log[H+]
H+ = 0,5mol * 0,03 = 0,015
H+ = 0,015
pH = -log[0,015] = 1,82
pH = 1,82