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[G] = 0,2mol/0,5Liter = 0,4 M
[H+] = √Kw/Kb.[G]
[H+] = √10^-14.10^-5.4x10^-1
[H+] = √4x10^-10
[H+] = 2x10^-5
pH = 5 - log 2