Why does ferric hydroxide sol coagulate on addition of potassium sulphate ?

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Please find the solution to the asked query:

According to Hardy-Schulze law, higher the valency of the oppositely charged ion of the electrolyte being added, the faster will be the coagulation.
Therefore,  when potasium sulphate is added the dispersed phase particles (colloidal particles) ,which are positively charged, takes up the negative ions which are the sulphate ions, and gets neutralized thus getting attracted to each other to form clumps and then coagulation takes place.

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Ferric hydroxide sol is an unstable sol which has weak attraction between its dispersed phase and dispersion medium. According to Hardy-Schzule Rule, when pottasium sulphate is added the dispersed phase particles (colloidal particles) ,which are positively charged, takes up the negative ions which are the sulphate ions, and gets neutralized thus getting attracted to each other to form clumps and then coagulation takes place.

Hope it helps!
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