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H^+ = √ Ka × M
10^-3 = √ 10^-5 × M
10^-6 = 10^-5 × M
M = 10^-1
M1 × V1 = M2 × V2
10^-1 × 10 = M2 × (10 + 90)
M2 = 0,01 ≈ 10^-2
H^+ = √ Ka × M
= √ 10^-5 × 10^-2
= 3,2 × 10^-4 M
pH = 4 - log 3,2