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asam asetat atau CH3COOH adalah asam lemah jadi memakai rumus:
[H+] = √Ka x M
= √10^-5 x 2.10^-3
= √2 x 10^-8
= 1,4 x 10^-4
[H^+]=2 × 10^-3
(2 × 10^-3)^2= Ka × M
4 × 10^-4= 10^-5 × M
M= 4 × 10^-1