Answer:
The charge on the colloidal particles
depends upon the preferential adsorption of the ions from the electrolyte that are
common with their own lattice ions. When \[AgN{{O}_{3}}\] is added to an
aqueous solution of KI, the yellow precipitate of \[AgI\] adsorbs \[{{I}^{-}}\]
ions from the electrolyte KI and forms negatively charged colloidal particles.
\[AgI+KI\xrightarrow{\,}\,\underset{\text{(fixed}\,\,\text{part)}}{\mathop{[AgI]{{I}^{-}}}}\,\,\,\,:\,\,\,\,\,\underset{\text{(diffused}\,\,\text{part)}}{\mathop{{{K}^{+}}}}\,\]
When formed on adding KI
solution to an aqueous solution of \[AgN{{O}_{3}}\] positively charged \[A{{g}^{+}}\]
ions are adsorbed from the electrolyte and the colloidal particles acquire
negative charge.
\[AgI+AgN{{O}_{3}}\xrightarrow{{}}\,\underset{\text{(fixed}\,\,\text{part)}}{\mathop{[AgI]A{{g}^{+}}}}\,\,\,\,\,\,:\underset{\text{(diffused}\,\text{part)}}{\mathop{NO_{3}^{-}}}\,\]
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