A cloudy, colloidal precipitate of Agl forms in a solution containing Nal and ex

Question

A cloudy, colloidal precipitate of Agl forms in a solution containing Nal and excess AgNO_3. How would you describe the surface of the growing colloidal precipitate? A positive surface from adsorbed Ag^+ ions, surrounded by a negative atmosphere of NO_3^- ions. A negative surface from adsorbed I^- ions surrounded by a positive atmosphere of Na^+ ions. A positive surface from adsorbed Na^+ ions surrounded by a negative atmosphere of I^- ions. A positive surface from adsorbed Ag^+ ions surrounded by a negative atmosphere of I^- ions. A negative surface from adsorbed I^- ions surrounded by a positive atmosphere of Ag^+ ions. A positive surface from adsorbed Na^+ ions surrounded by a negative atmosphere of NO_3^- ions. A negative surface from adsorbed NO_3^- ions surrounded by a positive atmosphere of Ag^+ ions. A negative surface from adsorbed NO_3^- ions surrounded by a positive atmosphere of Na^+ ions.

Explanation / Answer

Ag NO3 + NaI --------> Na NO3 + AgI (s)

When this Ag I is in excess silver nitrate solution peptization oxxurs and it becomes the colloidal presicipate

This colloidal precipitate of AgI has positive surface due to the adsorbed Ag+ ions( only common ion of the precipitate is adsorbed from the solution which in abundance) . Since Ag NO3 solution is in excess, the common ion Ag+ from it is adsorbed on the precipitate. The neutrality is maintained by a second layer of NO3- ons surrounding the positive surface of Ag+ ions.

Thus the option 1, 'A positive surface from adsorbed Ag+ ions surrounded bya negative atmosphere of NO3- ions' is correct.

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