If  Rf=106[Ag+][NH3]2 lit2.mol−2.s−1 & Rb=2×10−2[Ag(NH3)2]+, then "instability constant" for Ag++2NH3⇌[Ag(NH3)2]+(aq) is  (Rf, Rb= Rates of forward & backward reactions)

Ag++2NH3⇌[Ag(NH3)2]+      Kc=? At equilibrium state rf=rb 106[Ag+][NH3]2=2×10−2[Ag(NH3)2]+ ⇒[Ag(NH3)2]+[Ag+][NH3]2=1062×10−2=1082 ∴ Instability constant=1Kc=1(1082)=2×10−8