The aqueous solution of `Na_2SO_4` is neutral because

Options

A. both `Na^(+) and SO_4^(2-) ` ions interact heavily with water
B. Both `Na^(+) and SO_4^(2-) ` ions interact moderately with water
C. both `Na^(+) and SO_4^(2-) ` ions do not interact at all with water
D. `Na^(+) ` is a strong acid and `SO_4^(2-) ` is a strong base.

Answer

To determine why the aqueous solution of sodium sulfate (Na₂SO₄) is neutral, we can analyze the properties of the components involved in its formation and dissociation.

### Step-by-Step Solution:

1. **Identify the Components**: Sodium sulfate (Na₂SO₄) is formed from sodium hydroxide (NaOH), a strong base, and sulfuric acid (H₂SO₄), a strong acid.

2. **Understand the Nature of the Salt**: When a strong acid reacts with a strong base, the resulting salt is typically neutral. This is because the strong acid completely dissociates into its ions, and the strong base also completely dissociates.

3. **Dissociation of Sodium Sulfate**: In an aqueous solution, sodium sulfate dissociates into sodium ions (Na⁺) and sulfate ions (SO₄²⁻):
\[ \text{Na}_2\text{SO}_4 \rightarrow 2 \text{Na}^+ + \text{SO}_4^{2-} \]

4. **Lack of Hydrolysis**: Neither the sodium ions (Na⁺) nor the sulfate ions (SO₄²⁻) undergo hydrolysis. Hydrolysis is a reaction between the ions and water that can produce either H⁺ or OH⁻ ions, which would affect the pH of the solution.

5. **Conclusion on Neutrality**: Since neither ion interacts with water to produce H⁺ or OH⁻ ions, the solution remains neutral. The pH of the solution is around 7, indicating neutrality.

### Final Answer:
The aqueous solution of sodium sulfate (Na₂SO₄) is neutral because both sodium ions (Na⁺) and sulfate ions (SO₄²⁻) do not undergo hydrolysis in water, and thus do not affect the concentration of H⁺ or OH⁻ ions in the solution.

---