The Fajans titration uses an adsorption indicator to detect the endpoint of a titration in which a precipitate is formed. For the titration of $C{l}^{-}$by $A{g}^{+},$ insoluble AgCl is formed. Indicate what is happening at each step of the titration by completing each statement.

During the titration

a $C{l}^{-}$solution is added to an $A{g}^{+}$solution.

an $A{g}^{+}$solution is added to a $C{l}^{-}$solution.

At the endpoint, just past the equivalence point,

an excess of $C{l}^{-}$ions imparts a positive charge to the surface of the precipitate. an excess of $A{g}^{+}$ions imparts a negative charge to the surface of the precipitate. an excess of $A{g}^{+}$ions imparts a positive charge to the surface of the precipitate. an excess of $C{l}^{-}$ions imparts a negative charge to the surface of the precipitate.

When the endpoint is detected by a dye color change,

a cationic dye binds to the positive surface of the precipitate.

a cationic dye binds to the negative surface of the precipitate.

an anionic dve binds to the nositive surface of the precinitate.