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Methods to Form Lyophobic Colloids

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Question

Write the chemical method by which $F e (O H)_{3}$ sol is prepared from $F e C l_{3}$ .

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Solution

Ferric hydroxide forms a hydrophobic sol. Hence it is prepared indirectly by the hydrolysis of ferric chloride with boiling water. The reaction takes place as follows:
$F e C l_{3} + 3 H_{2} O \to F e (O H)_{3} + 3 H C l$

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