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# What does hardy schulze rule state?

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## 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: ${\mathrm{Al}}^{3+}>{\mathrm{Ba}}^{2+}>{\mathrm{Na}}^{+}$Similarly, in the coagulation of a positive sol, the order of flocculating power can be depicted as: $\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_{6}{\right]}^{4-}>{{\mathrm{PO}}_{4}}^{3-}>{{\mathrm{SO}}_{4}}^{2-}>{\mathrm{Cl}}^{–}$

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