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M1.V1 + M2.V2= M3.V3
100.10^-4 + 100.10^-3 = 200.M3
1100 . 10^-4 = 200 M3
M3= 5,5 .10^-4 molar
pH= -log H+
pH= -log 5,5.10^-4
pH= 4-log 5,5