Gold sol is an electronegative sol. The amoun | vedclass

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Question

(C) According to the $Hardy-Schulze$ rule,the coagulating power of an electrolyte depends on the valency of the active ion (the ion carrying a charge

Vedclass · Accepted Answer

$AlCl_3$

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(C) According to the $Hardy-Schulze$ rule,the coagulating power of an electrolyte depends on the valency of the active ion (the ion carrying a charge opposite to that of the colloidal particles).For an electronegative sol like gold sol,the coagulating power depends on the cation.The higher the valency of the cation,the greater is its coagulating power,and thus,the minimum amount of electrolyte is required.The valencies of the cations in the given options are: $Na^+$ $(+1)$,$Ca^{2+}$ $(+2)$,and $Al^{3+}$ $(+3)$.Since $Al^{3+}$ has the highest valency,$AlCl_3$ will have the maximum coagulating power,requiring the minimum amount for coagulation.

Gold sol is an electronegative sol. The amount of electrolyte required to coagulate a certain amount of gold sol is minimum in the case of

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