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Why is FeOH3 ...

Question

Why is $F e (O H)_{3}$ colloid positively charged, when prepared by adding $F e C l_{3}$ to hot water?

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Solution

When $F e C l_{3}$ is added to hot water, hydrated ferric oxide is formed.

This hydrated ferric oxide preferably adsorbs $F e^{3 +}$ ions. Therefore, the colloidal solution becomes positively charged.

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Standard VII Chemistry

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