What is meant by coagulation of a colloidal solution? Describe briefly
any three methods by which coagulation of lyophobic sols can be
The process of setting of colloidal particles is called coagulation or
precipitation of the sol.
Methods of coagulation:
(i) By electrophoresis: The colloidal particles move towards oppositely
(ii) By mixing two oppositely charged sols.
(iii) By addition of electrolytes: When excess of an electrolyte is added,
the colloidal particles are precipitated.