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hcl04=10 -5
[H^+] = a × M
= 1 × 10^-3
= 10^-3
pH = 3
pH asam asetat sama dengan pH HClO3 yaitu 3, dan karena asam asetat meruapakan asam lemah, maka
[H^+] = √ Ka × M
10^-3 = √ 10^-5 × M
M = 10^-1 ≈ 0,1 M