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= √10^-14/10^-5 x 2 x 10^-3
= √2x 10^-12
= 1,4 x 10^-6
pOH = - log 1,4 x 10^-6
= 6 - log 1,4
pH = pKW - pOH
= 14 - 6 - log 1,4
= 8 - log 1,4
= 7,85 <--