On the basis of Hardy-schulze rule explain why the coagulating power of phosphate is higher than chloride ?

Explanation

Coagulating power of an electrolyte depends upon the charge on the ion having charge opposite to that of the colloidal particles. Grater the charge on the oppositely charged ion, small is its smount required for coagulation and hance greater is its coagulating power. Hence, for a +vely charged sol, `PO_(4)^(3-)` ion with three units of -ve charge has greater coagulating power than `CI^(-)` ion with one unit -ve charge.