Perbandingan suatu campuran larutan ammonia 2 M dengan larutan ammonia klorida 2 M yang harus dicampur untuk membuat larutan penyangga dengan pH = 8 (Kb NH3(aq)

n NH3 = V NH3 × [NH3]
n NH3 = V NH3 × 2 M = (2 V NH3) mol

n NH4Cl = V NH4Cl × [NH4Cl]
n NH4Cl = V NH4Cl × 2 M = (2 V NH4Cl) mol

pH = 8
pOH = pKw - pH = 14 - 8 = 6

[OH-] = 10^-pOH = 10^-6

[OH-] = Kb NH3 × n NH3 / n NH4
10^-6 = 10^-5 × (2 V NH3) mol / (2 V NH4Cl) mol
V NH3 / V NH4Cl = 0,1 = 1 / 10

Jawaban = V NH3 : V NH4Cl = 1 : 10