The aqueous solution of `AICI_(3)` is acidic due to

Options

A. `AI(OH)_(3) + HCI`
B. `[AI(H_(2) O)_(6)]^(3+) + 3CI^(-)`
C. `AICI_(3). 2H_(2)O`
D. `AI_(2)O_(3) + HCI`

Explanation

To solve the question regarding why the aqueous solution of aluminum chloride (AlCl₃) is acidic, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Aluminum Chloride in Water**:
- When aluminum chloride (AlCl₃) is dissolved in water, it dissociates into aluminum ions (Al³⁺) and chloride ions (Cl⁻).
- The dissociation can be represented as:
\[ \text{AlCl}_3 (s) \rightarrow \text{Al}^{3+} (aq) + 3 \text{Cl}^- (aq) \]

2. **Formation of Hydrolyzed Species**:
- The aluminum ion (Al³⁺) is a small, highly charged cation. It has a strong tendency to hydrolyze in water, forming a complex ion.
- The hydrolysis reaction can be represented as:
\[ \text{Al}^{3+} (aq) + 6 \text{H}_2\text{O} (l) \rightarrow \text{[Al(H}_2\text{O)}_6]^{3+} (aq) \]

3. **Release of Hydrogen Ions**:
- The complex ion \([Al(H_2O)_6]^{3+}\) can further react with water, leading to the release of hydrogen ions (H⁺):
\[ \text{[Al(H}_2\text{O)}_6]^{3+} (aq) \rightleftharpoons \text{[Al(H}_2\text{O)}_5(OH)]^{2+} (aq) + \text{H}^+ (aq) \]
- This reaction indicates that for every mole of \([Al(H_2O)_6]^{3+}\), three moles of H⁺ ions are produced.

4. **Conclusion about Acidity**:
- Since the hydrolysis of Al³⁺ produces H⁺ ions, the solution becomes acidic. Any solution that generates H⁺ ions is classified as acidic.
- Therefore, the aqueous solution of aluminum chloride is acidic due to the formation of H⁺ ions from the hydrolysis of Al³⁺ ions.

### Final Answer:
The aqueous solution of AlCl₃ is acidic due to the hydrolysis of Al³⁺ ions, which generates H⁺ ions in solution.

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