Question

Which of the following electrolytes is most effective for the coagulation of AgI/Ag+ sol?
MgCl₂, K₂SO₄, K₄[Fe(CN)₆]

Answer 1

$[Fe(CN)_6]^{4-}$ is most effective in bringing the coagulation of positively charged $AgI/Ag^+$ colloid.

Explanation:

$AgI/Ag^+$ sol is positively charged. In order to bring about the coagulation oppositely charged ions must be added.

According to Hardy Schulze rule, greater the charge on the oppositely charged ion of the electrolyte added, more effective is the coagulation. Thus to coagulate a positively charged colloid, we must see the negatively charged ions.

$MgCl_2$ contains $Cl^{-}$ ions, $K_2SO_4$ contains $SO_4^{2-}$ ions, $K_4[Fe(CN)_6$ contains $[Fe(CN)_6]^{4-}$ ions.

Thus $[Fe(CN)_6]^{4-}$  bearing the highest negative charge is most effective in bringing the coagulation of positively charged $AgI/Ag^+$  colloid.

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