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mmol HCl = 50 x 0,2 = 10 mmol
NH4OH + HCl => NH4Cl + H2O
a: 10 10
b: 10 10 10 10
s: - - 10 10
[NH4Cl] = 10 mmol/100 ml = 0,1 M
[H] = √kw/kb x M
karena Kb tidak di tulis, maka di asumsikan secara umum Kb NH3 = 10⁻⁵
[H+] = √ 10⁻¹⁴/10⁻⁵ x 0,1
[H+] = √ 10⁻¹⁰ = 10⁻⁵
pH = - log [H+]
pH = - log 10⁻⁵
pH = 5