`PbSO_(4)` is soluble in (a) _____ due to formation of (b) _____.

Answer

To solve the question regarding the solubility of lead sulfate (PbSO₄), we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Solvent**:
- Lead sulfate (PbSO₄) is known to be insoluble in water but can dissolve in certain organic solvents or complexing agents. One such compound is ammonium acetate (CH₃COONH₄).

2. **Write the Reaction**:
- When lead sulfate is treated with ammonium acetate, a reaction occurs. The equation can be written as:
\[ \text{PbSO}_4 + 2 \text{CH}_3\text{COONH}_4 \rightarrow \text{Pb(CH}_3\text{COO)}_2 + \text{(NH}_4)_2\text{SO}_4 \]
- In this reaction, lead sulfate reacts with ammonium acetate to form lead acetate and ammonium sulfate.

3. **Identify the Product**:
- The product formed from this reaction is lead acetate (Pb(CH₃COO)₂), which is soluble in the solution.

4. **Conclusion**:
- Therefore, the answer to the question is:
- (a) Ammonium acetate
- (b) Lead acetate

### Final Answer:
- PbSO₄ is soluble in (a) **Ammonium acetate** due to formation of (b) **Lead acetate**.