Calculate the ratio of `[Ag(S_2O_3)_2]^(-3)` and `[Ag^+]` in 0.1 M `S_2O_3` solution. Given the stability or formation constant of `[Ag(S_2O_3)_2]^(-3)` is `1.0xx10^13`.

Explanation

The equilibrium is `Ag^(+) +2S_2O_3^(-2) overset(K_f)hArr [Ag(S_2O_3)_2]^(-3)`
`therefore` Stability constant
`K_f=([Ag(S_2O_3)_2]^(-3))/([Ag^+][S_2O_3^(-2)]^2)`
`=1.0xx10^13` (given)
`therefore ([Ag(S_2O_3)_2]^(-3))/([Ag^+])=1.0xx10^13xx[S_2O_3^(-2)]^2`
`=1.0xx10^13xx(0.1)^2`
`=1.0xx10^11`