Explain what is observed when
(i) an electrolyte, KCl, is added to a hydrated ferric oxide sol.
(ii) an electric current is passed through a colloidal solution.
(iii) a beam of strong light is passed through a colloidal solution.
Dear Student
(i) KCl is added to hydrated ferric oxide sol where it dissociates into K+ and Cl- ions. The positively charged colloidal particles of hydrated Ferric oxide sol get coagulated in the presence of negatively charged chloride ions provided by KCl.
(ii) On passing the electric current, colloidal particles (which are positively or negatively charged) move towards the oppositely charged electrode, where they lose their charge and get coagulated.
(iii) When a beam of strong lights is passed through a colloidal solution, we observe Tyndall effect. The scattering of light by colloidal particles takes place and the path of light becomes visible (path of beam is illuminated). This phenomenon is called Tyndall effect.
Regards
(i) KCl is added to hydrated ferric oxide sol where it dissociates into K+ and Cl- ions. The positively charged colloidal particles of hydrated Ferric oxide sol get coagulated in the presence of negatively charged chloride ions provided by KCl.
(ii) On passing the electric current, colloidal particles (which are positively or negatively charged) move towards the oppositely charged electrode, where they lose their charge and get coagulated.
(iii) When a beam of strong lights is passed through a colloidal solution, we observe Tyndall effect. The scattering of light by colloidal particles takes place and the path of light becomes visible (path of beam is illuminated). This phenomenon is called Tyndall effect.
Regards