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pOH=5
[OH-]=10-5
[OH-]=Kb.Mol NH3/Mol NH4Cl
10-5=10-5.Mol NH3/Mol NH4Cl
Mol NH4Cl=Mol NH3
V1.M1=V2.M2
1.M1=2.M2
Biar hasilnya sama maka M1=2,M2=1,jadi M1:M2=2:1