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Question

What does hardy schulze rule state?


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Solution

Hardy schulze rule:

  • “The greater the valency of the flocculating ion added, the greater is its power to cause precipitation. This is known as Hardy-Schulze rule.”
  • The coagulating power increases with the valency of an ion.
  • For example, in the coagulation of a negative sol, the order of flocculating power can be depicted as:

Al3+>Ba2+>Na+

  • Similarly, in the coagulation of a positive sol, the order of flocculating power can be depicted as:

[Fe(CN)6]4->PO43->SO42->Cl


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