. Describe a conspicuous change observed when


Describe a conspicuous change observed when

(i) a solution of NaCl is added to a sol of hydrated ferric oxide.

(ii) a beam of light is passed through a solution of NaCl and then through a sol.

Best Answer

(i) The positively charged colloidal particles of Fe(OH)3 get coagulated by negatively charged Cl – ions provided by electrolyte sodium chloride.

(ii) The path of light is not visible when light is passed through NaCl solution but visible when light is passed through a sol due to scattering of light by colloidal particles

Talk to Our counsellor