Ferric chloride forms both positively and negatively charged sols. Explain.

Explanation

To explain how ferric chloride forms both positively and negatively charged sols, we can break down the process into clear steps:

### Step 1: Understanding Ferric Chloride
Ferric chloride (FeCl₃) is a salt that, when dissolved in water, dissociates into ferric ions (Fe³⁺) and chloride ions (Cl⁻).

### Step 2: Formation of Positively Charged Sol
1. **Addition to Hot Water**: When ferric chloride is added to excess hot water, it undergoes hydrolysis.
2. **Hydrated Ferric Oxide Formation**: This leads to the formation of hydrated ferric oxide, represented as Fe₂O₃·xH₂O.
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