Ag++NH3⇌AgNH3+;K1=3.5×10−3AgNH3++NH3⇌AgNH32+;K2=1.7×10−3The instability constant of AgNH32+ is

Equation (1) + Equation (2) + Ag++2NH3→AgNH32+,K=K1K2‘K’ is called stability constantK = (3.5 x 10-3) (1.7 x 10-3)K = 3.5 x 1.7 x 10-6Instability constant, β=1KInstability constant, β=1063.5×1.7Instability constant, β=1.69×105