Question
Explain what is observed
An electrolyte, NaCl is added to hydrated ferric oxide sol.
An electrolyte, NaCl is added to hydrated ferric oxide sol.
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Answer
When NaCl is added to ferric oxide sol, it dissociates to give $\mathrm{Na}^{+}$and $\mathrm{Cl}^{-}$ions. Particles of ferric oxide sol are positively charged. Thus, they get coagulated in the presence of negatively charged $\mathrm{Cl}^{-}$ions.
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