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= √ ( 10^ -14 ÷ 2 × 10^ -4 ) × ( 6,8 ÷ 68 ) × ( 1000 ÷ 500 )
= 3,2 × 10^ -6
pOH = 6 - log 3,2 ⇒ pH = 8 + log 3,2 = 8,5