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H^ + = √ (Kw ÷ Kb) × ( gr ÷ Mr ) × ( 1000 ÷ mL )
10^ -5,5 = √ (10^ -14 ÷ 10^ -5 ) × ( gr ÷ 35 ) × ( 1000 ÷ 250 )
10^ -11 = 10^ -9 × ( gr ÷ 35 ) × 4
gr = ( 10^ -11 × 35 ) ÷ ( 10^ -9 × 4) = 0,0875 gr