Question

During electrophoresis, the particles of which of the following solutions would move towards the anode? TiO2 sol AI2O3xH2O sol Gold sol Methylene blue sol​

Answer 1

Answer:

The colloidal sol of Fe(OH)3 has positive charge due to the preferential adsorption of ferric ions (Fe3+) on the surface of the ferric hydroxide particles.

Fe(OH)3+Fe3+→Fe(OH)3⋅Fe3+

Hence, during electrophoresis of colloidal sol of Fe(OH)3, the colloidal particles move towards cathode (negatively charged electrode).