Why fecl3 and naoh give negatively charged sol?
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See, when FeCl3 is treated with water it forms Fe(OH)3 forming Fe3+ ions(in excess) and these positive ions are adsorbed.(preferentially)
But when FeCl3 is treated with NaOH there is also formation of Fe(OH)3 but now OH- ions are in excess therefore they will get preferentially adsorbed thus forming negatively charged Sol.
But when FeCl3 is treated with NaOH there is also formation of Fe(OH)3 but now OH- ions are in excess therefore they will get preferentially adsorbed thus forming negatively charged Sol.
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