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= 0,04 ÷ 2
= 0,02
[H^+] = √Ka × M
= √10-4 × 2 × 10^-2
= 1,4 × 10^-3
pH = 3 - log 1,4
b. [OH^-] = √Kb × M
= √1,8 × 10^-5 × 0,02
= 6 × 10^-4
pOH = 4 - log 6 ⇒ pH = 10 + log 6