A solution is a mixture of `0.06M` KCl and `0.06 M Kl. AgNO_(3)` solution is being added drop by drop till AgCl starts precipitating `(K_(sp)AgCl=1xx10^(-10)` and `K_(sp)Agl=4xx10^(-16))`. The concentration of iodide ion at this instant will be nearly equal to `:`