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m 4 4
b 4 4 4 4
s - - 4 4
M HCOOK = 4 ÷ 200 = 0,02
OH^- = √ (Kw ÷ Ka) × M
= √ (10^-14 ÷ 2 × 10^-4) × 2 × 10^-2
= 10^-6
pOH = 6 ⇒ pH = 8