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M HCN = 4,9/1
M HCN = 4,9 M
[H⁺] = √Ka . M
[H⁺] = √10⁻¹⁰ x 4,9
[H⁺] = √4,9 x 10⁻¹⁰
[H⁺] = 2,2 x 10⁻⁵
pH = -log [H⁺]
pH = -log [2,2 x 10⁻⁵]
pH = 5 - log 2,2
Jadi, pH larutan adalah 5 - log 2,2