[H+] = Ka . mol asam / garam
= 2 x 10^-4 . 500/500
= 2 x 10^-4
maka pH = 4 - log 2
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[H+] = Ka . mol asam / garam
= 2 x 10^-4 . 500/500
= 2 x 10^-4
maka pH = 4 - log 2