HA is a weak acid and BOH is a weak base. For which of the following salts the extent of hydrolysis is independent of the salt in its aqueous solution

Options

A. NaA
B. NaB
C. BCl
D. BA

Answer

To solve the problem, we need to determine the extent of hydrolysis of salts formed from weak acids and weak bases and identify which of these salts has hydrolysis that is independent of the salt concentration in its aqueous solution.

### Step-by-Step Solution:

1. **Understanding Hydrolysis**: Hydrolysis is the reaction of a salt with water to produce an acid and a base. The extent of hydrolysis can be quantified using the degree of hydrolysis (H) and the hydrolysis constant (kH).

2. **Identify the Types of Salts**: We have four types of salts based on the strength of the acid and base from which they are derived:
- Salt of a weak acid and a weak base (HA and BOH)
- Salt of a weak acid and a strong base
- Salt of a strong acid and a weak base
- Salt of a strong acid and a strong base

3. **Formulas for Hydrolysis**:
- For a salt of weak acid (HA) and weak base (BOH):
\[ k_H \cdot k_A \cdot k_B = k_W \]
Where \( k_W \) is the ion product of water.
- The degree of hydrolysis (H) is given by:
\[ H = \frac{H}{1-H} = \sqrt{\frac{k_W}{k_A \cdot k_B}} \]
- For a salt of a weak acid and a strong base:
\[ k_H \cdot k_A = k_W \]
- For a salt of a strong acid and a weak base:
\[ k_H \cdot k_B = k_W \]
- For a salt of strong acid and strong base, hydrolysis does not occur.

4. **Analyzing the Hydrolysis of Weak Acid-Weak Base Salts**: The hydrolysis extent for salts formed from weak acids and weak bases is independent of the concentration of the salt in solution. This is because the hydrolysis constant and the dissociation constants of the weak acid and weak base are constant values.

5. **Conclusion**: Therefore, the extent of hydrolysis is independent for salts that are formed from weak acids and weak bases.

### Final Answer:
The extent of hydrolysis is independent for salts formed from weak acids and weak bases.