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

Explanation

Minimum quantity of an electrolyte required to cause precipitation of a sol is called its coagulating value. Greater the charge on flocculating ion and smaller is the amount of electrolyte required for precipitation, higher is the coagulating power of coagulating ion (Hardy-Schulze Law).
Phosphate ion bear - 3 charge while chloride ion carries only - 1 charge and due to high charge phosphate ion has high coagulating power than that of chloride ion.