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17 Jul 2007 21:26:31 IST

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HARDY-SCHULZE RULE

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What are the possible modifications in Hardy-Schulze rule?

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Asmit Bhowmick

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17 Jul 2007 21:38:41 IST

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What do you mean by modifications?

aparna ravi

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17 Jul 2007 21:54:12 IST

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It is a question in NCERT textbook for class XII.The question is"What modification can u suggest in the Hardy Schulze law"?

Asmit Bhowmick

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17 Jul 2007 22:05:13 IST

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Well,you can say the modification will have something to do with regards to the size of the ions considered,because the original rule does not refer to them.For example compare [Fe(CN)6]-4 and (PO4)-3.The original rule would suggest Fe complex to have better coagulating power.However it does not take into account the mass of the complex compared to phosphate ion.This is why the "Gold number "concept has been brought in.

Good question.

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aparna ravi

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17 Jul 2007 22:19:00 IST

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thank u asmit.Now I could understand Hardy Schulze law much better

arun-rashi

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17 Jul 2007 23:59:13 IST

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Modification suggested is as follows 1.To what power of valency or charge coagulating power of coagulating ion is proportional to , now it modified that coagulating power is directly proportional to fourth power of the valency of coagulating ion .2.Adsorbing power of ions shud also be considered while discussing coagulating power for e.g cogullation value value of H+ is very low among monovalent cations & BrO3-1 also have very low value among anions this is bec both the ions are strongly adsorbed. 3.The ions carrying same charge as the colliod particles is also effective in some way in determining the coagulation value of electrolyte for e.gcoagulation value for pot.citrate ,pot.acetate for arsenious sulphide sol(negatively charged) are diff & found to be 270 &115 milimoles per litre although coagulating ion is same in both the cases i.e potassium but actually citrate & acetate anions are adsorbed to diff extents on the surface of arsenious sulphide particles thus raising the negative zeta potential of particles to diff extent

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