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[H⁺] = 1,99.10⁻⁶
[H⁺] = Ka . perbandingan buffer
1,99.10⁻⁶ = 1,8.10⁻⁵ × perbandingan buffer
perbandingan buffer = 0,11
Maka untuk memperoleh pH 5,7, diperlukan perbandingan buffer 0,11 : 1
atau 11 : 100
SOLVED!