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M: 10 mmol 5 mmol
R: -5 mmol -5 mmol + 5 mmol
S: 5 mmol 5 mmol
Capuran berupa penyangga
[H+] = Ka.asam/garam
= 10^-5 x 5 mmol/5 mmol
= 10^-5
pH = -log 10^-5
= 5