Question

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

Answer 1

$1.$ Minimum quantity of an electrolyte required to cause precipitation of a sol is called its coagulating value.

$2.$ 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).

$3.$ Phosphate ion bears $-3$ charge while chloride ion carries only $-1$ charge and due to high charge the coagulating power of phosphate is higher than chloride.