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Which one of the following electrolytes ...

Which one of the following electrolytes is most effective for the coagulation of `Fe(OH)_(3) sol` and why?
`NaCl, Na_(2)SO_(4),Na_(3)PO_(4)`

Text Solution

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`Fe(OH)_(3)` is a positively charges sol. According to Hardy-Schulze rule, greater the charge on the oppositely charged ion of the electrolyte added, more effective it is in bringing about coagulation. Hence `Na_(3)PO_(4)` (containing `PO_(4)^(3-)` ions) is most effective.
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