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A colloidal solution of Agl is prepared ...

A colloidal solution of `Agl` is prepared by two different methods as shown in the figure below:


What is the charge of `Agl` colloidal particles in the two test tubes `(A)` and `(B)` ?
b. Given reasons for the origin of charge.

Text Solution

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IN test tube [A] the colloidal particles of AgI will acquire negative charge by adsorbing `I^(-)` ions from KI present in the dispersion medium.
`AgI +underset(("dispersion medium"))(I)to underset(("Negative sol"))([AgI]I^(-)`
In test tube [B] the colloidal particles of AgI will acquire positive charge by adsorbng `Ag^(+)` ions from the dispersion medium.
`AgI +underset(("From dispersion medium"))(Ag^(+))to underset(("Positive sol"))([AgI]Ag^(+)`
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