设AgNO3的起始浓度为 2X,那么就有
Ag+ + 2NH3 [Ag(NH3)2]+
Kf=[Ag(NH3)2]+/[Ag+][NH3]^2 = X/X[NH3]^2=1/[NH3]^2
[NH3]= 2.45x10^-4 mol/L