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What is Hardy Schulze rule? Which of the following electrolyte will coagulate most easily to positively charged colloid & why? Na3PO4, NaCl, Na2SO4

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Coagulating value of a coagulating ion is directly proportional to the charge on the ion. 

Na3PO4 will coagulate a positively charged colloid most easily because it has most negative valence.

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