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What happens in the following activities and why? (i) An electrolyte is added to a hydrated ferric oxide sol in water.

Monjur Alahi

What happens in the following activities and why?
(i) An electrolyte is added to a hydrated ferric oxide sol in water.
(ii) A beam of light is passed through a colloidal solution.
(iii) An electric current is passed through a colloidal solution.


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Salim Ahmed Kawsar

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(i) The positively charged colloidal particles of Fe(OH)3 get coagulated by the negatively charged ions provided by electrolyte.
(ii) The path of light becomes visible due to scattering of light by colloidal particles (Tyndall effect).
(iii) Electrophoresis takes place in which colloidal particles move towards the oppositely charged electrode where they lose their charge and get coagulated.

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