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M: 3 mmol 4 mmol
R: -3 mmol -3 mmol +3 mmol
S: 1 mmol 3mmol
[NaOH] = 1 mmol/ 70 ml
= 1,4 x 10^-2 M
pOH = - log 1,4 x 10^-2 = 2 - log 1,4
pH = 14 -( 2 - log1,4) = 12 + log 1,4