Explain what isobserved
(i) When a beamof light is passed through a colloidal sol.
(ii) Anelectrolyte, NaCl is added to hydrated ferric oxide sol.
(iii) Electriccurrent is passed through a colloidal sol?
Explain what isobserved
(i) When a beamof light is passed through a colloidal sol.
(ii) Anelectrolyte, NaCl is added to hydrated ferric oxide sol.
(iii) Electriccurrent is passed through a colloidal sol?
(i) When a beam of light is passed through a colloidalsolution, then scattering of light is observed. This is known as theTyndall effect. This scattering of light illuminates the path of thebeam in the colloidal solution.
(ii) When NaCl is added to ferric oxide sol, it dissociates togive Na+ and Cl- ions. Particles of ferricoxide sol are positively charged. Thus, they get coagulated in thepresence of negatively charged Cl- ions.
(iii) The colloidal particles are charged and carry either apositive or negative charge. The dispersion medium carries an equaland opposite charge. This makes the whole system neutral. Under theinfluence of an electric current, the colloidal particles movetowards the oppositely charged electrode. When they come in contactwith the electrode, they lose their charge and coagulate.
(i) When a beam of light is passed through a colloidalsolution, then scattering of light is observed. This is known as theTyndall effect. This scattering of light illuminates the path of thebeam in the colloidal solution.
(ii) When NaCl is added to ferric oxide sol, it dissociates togive Na+ and Cl- ions. Particles of ferricoxide sol are positively charged. Thus, they get coagulated in thepresence of negatively charged Cl- ions.
(iii) The colloidal particles are charged and carry either apositive or negative charge. The dispersion medium carries an equaland opposite charge. This makes the whole system neutral. Under theinfluence of an electric current, the colloidal particles movetowards the oppositely charged electrode. When they come in contactwith the electrode, they lose their charge and coagulate.
