An acidic buffer solution can be prepared by mixing solution of

Options

A. Sodium acetate and acetic acid
B. Ammonium chloride and ammonium hydroxide
C. Sulphuric acid and sodium sulphate
D. Sodium chloride and sodium hydroxide.

Explanation

To prepare an acidic buffer solution, we need to mix a weak acid with its salt (which is derived from a strong base). Here’s a step-by-step solution to the question:

### Step-by-Step Solution:

1. **Identify the Components of an Acidic Buffer:**
An acidic buffer is typically composed of a weak acid and its conjugate base (the salt formed from the weak acid and a strong base).

2. **Analyze the Given Options:**
- **Option A:** Sodium acetate (CH₃COONa) and acetic acid (CH₃COOH)
- Here, acetic acid is a weak acid, and sodium acetate is the salt of this weak acid (derived from the strong base NaOH). This combination will create an acidic buffer.

- **Option B:** Ammonium chloride (NH₄Cl) and ammonium hydroxide (NH₄OH)
- Ammonium hydroxide is a weak base, and ammonium chloride is its salt. This combination will create a basic buffer, not an acidic buffer.

- **Option C:** Sulfuric acid (H₂SO₄) and sodium sulfate (Na₂SO₄)
- Sulfuric acid is a strong acid, and sodium sulfate is its salt. This combination does not form an acidic buffer because it does not involve a weak acid.

- **Option D:** Sodium chloride (NaCl) and sodium hydroxide (NaOH)
- Sodium hydroxide is a strong base, and sodium chloride is a salt. This combination does not form an acidic buffer.

3. **Conclusion:**
The only option that correctly forms an acidic buffer solution is **Option A: Sodium acetate and acetic acid.**

### Final Answer:
An acidic buffer solution can be prepared by mixing a solution of **sodium acetate and acetic acid.**

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