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When freshly precipitated Fe(OH)3 is boi...

When freshly precipitated `Fe(OH)_3` is boiled with water in the presence of a few drops of dil. HCl, a hydrated ferric hydroxide sol is obtained. This method is termed as

A

Dialysis

B

peptization

C

Ultrafiltration

D

Electrodispersion

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The correct Answer is:
To solve the question regarding the method used to obtain a hydrated ferric hydroxide sol from freshly precipitated `Fe(OH)3`, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Reaction**: - Freshly precipitated `Fe(OH)3` is a solid precipitate formed from the reaction of ferric ions with hydroxide ions. - When this precipitate is boiled with water and a few drops of dilute HCl, we need to analyze what happens to the precipitate. 2. **Role of Dilute HCl**: - The dilute HCl acts as an electrolyte. It helps in breaking down the precipitate of ferric hydroxide into smaller particles. - The presence of HCl provides H+ ions, which can interact with the hydroxide ions in `Fe(OH)3`, facilitating the transformation into a colloidal form. 3. **Formation of Hydrated Ferric Hydroxide Sol**: - As the precipitate interacts with water and HCl, it undergoes a process that converts it into a colloidal solution, which is referred to as a sol. - This sol is known as hydrated ferric hydroxide, which means that the ferric hydroxide particles are now dispersed in water. 4. **Identifying the Process**: - The process of converting a freshly prepared precipitate into a colloidal solution in the presence of an electrolyte (like dilute HCl) is termed **peptization**. - Peptization is a method used to stabilize colloidal solutions by breaking down larger particles into smaller ones, allowing them to remain suspended in the liquid. 5. **Conclusion**: - Therefore, the method described in the question is termed **peptization**. ### Final Answer: The method is termed as **peptization**.
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