FeCl2+2NaOH=Fe(OH)3+2NaCl
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A negatively charged sol of hydrated ferric oxide is formed when ferric chloride is added to NaOH solution as follows: FeCl3 + 2NaOH → Fe(OH)3 + 3NaCl. The neagtively charged sol is obtained because of the preferential adsorption of the OH− ions which form an electrical double layer.........
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