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= 1,8 . 10⁻⁵ 100 . 0,1 / 500 . 0,1
= 1,8 . 10⁻⁵ . 10 / 50
= 18 .10⁻⁵ / 50
= 0,36 . 10⁻⁵
= 36 . 10⁻⁷
pOH = - log [OH⁻]
= - log 36 . 10⁻⁷
= 7 - log 36
pH = 14 - pOH
= (14 - 7 ) - log 36
= 7 - log 36