Basicity of acetic acid is

Options

A. 4
B. 3
C. 2
D. 1

Answer

To determine the basicity of acetic acid, we can follow these steps:

### Step-by-Step Solution:

1. **Define Basicity**: Basicity refers to the number of replaceable hydrogen ions (H⁺) in an acid.

2. **Identify the Formula of Acetic Acid**: The chemical formula for acetic acid is CH₃COOH.

3. **Dissociation of Acetic Acid**: When acetic acid dissociates in solution, it can be represented as:
\[ \text{CH}_3\text{COOH} \rightleftharpoons \text{CH}_3\text{COO}^- + \text{H}^+ \]
This equation shows that acetic acid produces one H⁺ ion upon dissociation.

4. **Count the Replaceable H⁺ Ions**: Since acetic acid dissociates to produce only one H⁺ ion, it has one replaceable hydrogen ion.

5. **Perform a Reaction with a Base**: To further confirm, we can react acetic acid with sodium hydroxide (NaOH):
\[ \text{CH}_3\text{COOH} + \text{NaOH} \rightarrow \text{CH}_3\text{COONa} + \text{H}_2\text{O} \]
In this reaction, the H⁺ from acetic acid is replaced by Na⁺ from sodium hydroxide, indicating that only one H⁺ ion is replaced.

6. **Conclusion**: Since acetic acid produces one replaceable H⁺ ion, its basicity is 1.

### Final Answer:
The basicity of acetic acid is 1.

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