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mmol HCN = 100 x 0,1 = 10 mmol
NaOH + HCN => NaCN + H2O
a : 5 10
b : 5 5 5 5
s : - 5 5 5
[H+] = ka x mol asam/mol garam
[H+] = 10⁻⁵ x 5/5
[H+] = 10⁻⁵
pH = - log [H+]
pH = - log 10⁻⁵
pH = 5