freshly prepared ferric chloride is treated with excess of hot water.
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If FeCl3 is added to excess of hot water, a postively charged sol of hydrated ferric oxide is formed due to adsorption of Fe3+ ions. However, when ferric chloride is added to NaOH, a negatively charged sol is obtained with adsorption of OH- ions.
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When FeCl3 is added to hot water, hydrated ferric oxide is Fe2O3,xH2O is formed. It adsorbs Fe3+ ions from FeCl3 on is surface. As a result, the colloidal particles become positively charged.
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