Q.
A colloidal solution is subjected to an electric field than colloidal particles more towards anode. The amount of electrolytes of BaCl2,AlCl3 and NaCl required to coagulate the given colloid is in the order
Hardy Schulze Law: The effective ions of the electrolytes in bringing about coagulation are those which carry a charge opposite to that of colloidal particles. Greater the valency of coagulating or fluctuating ion, greater is its power to bring about coagulation.
When colloidal solution is subjected to electrical field, coagulating power should be in the order of AlCl3>BaCl2>NaCl as thier valency is increasing.