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Why is Fe(OH)(3) colloid positively char...

Why is `Fe(OH)_(3)` colloid positively charged when prepared by adding `FeCl_(3)` to hot water ?

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Charge on sol is decided by adsorption of ions present in medium. Adsorption of positively charged `Fe^(3+)` ions takes place by the sol of hydrated ferric oxide. Thus, `Fe(OH)_(3)` colloid has positive charge when prepared by adding `Fe(OH)_(3)` to hot water.
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