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

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. Eidsorption of positively charged `Fe^(3+)` ions takes place byl 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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