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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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(i) (A) negative sol
(B) positive sol
(ii) The origin of charge is the selective adsorption of ions from the dispersion medium. The particles constituting the dispersed phase adsorb only those ions preferentially which are common with their own lattice ions. For example, if silver nitrate solution is added to an aqueous solution of potassium iodide, the silver iodide formed will adsorb negative I-ions (common ions) from the dispersion medium to form a negatively charged sol.
`AgI + underset("medium")underset("Dispersion")(I^(-)) to underset("negative sol")(AgI : I^(-))`
However, if silver iodide is formed by adding potassium iodide to silver nitrate solution, the sol will be positively charged due to the adsorption of Ag+ ions (common ions) present in the dispersion medium.
`AgI + underset("medium")underset("Dispersion")(Ag^(+)) to underset("Positive sol.")(AgI : Ag^(+))`
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