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wzór pH + pOH = 14 po przekształceniu pH = 14 - pOH
obliczamy pOH pOH = -log [OH⁻] = -log 0,00001 mol/dm³=5
po podstawieniu do wzoru pH = 14 - 5 = 9
10^-x mol/dm3
[OH^-] = 10^-5
pH + pOH = 14
14-x= pOH
14-5 = 9
pH tego roztworu wynosi 9