Which of the following sulphates are soluble in water?

Options

A. `CuSO_(4)`
B. `PbSO_(4)`
C. `Ag_(2)SO_(4)`
D. `BaSO_(4)`

Answer

To determine which of the following sulfates are soluble in water: CuSO4, PbSO4, Ag2SO4, and BaSO4, we can analyze each compound based on their properties.

### Step-by-Step Solution:

1. **Analyze CuSO4 (Copper(II) sulfate)**:
- CuSO4 is an ionic compound.
- It is known to be soluble in water.
- The reason for its solubility is that water is a polar solvent, and ionic compounds tend to dissolve well in polar solvents due to the attraction between the polar water molecules and the ions in the compound.
- **Conclusion**: CuSO4 is soluble in water.

2. **Analyze PbSO4 (Lead(II) sulfate)**:
- PbSO4 is a hard crystalline solid.
- It is known to be insoluble in water.
- The strong ionic bonds in PbSO4 make it difficult for water molecules to break apart the solid structure.
- **Conclusion**: PbSO4 is not soluble in water.

3. **Analyze Ag2SO4 (Silver sulfate)**:
- Ag2SO4 is also an ionic compound.
- It is considered to be sparingly soluble in water, meaning it does dissolve to some extent, but not as readily as CuSO4.
- **Conclusion**: Ag2SO4 is soluble in water.

4. **Analyze BaSO4 (Barium sulfate)**:
- BaSO4 is another hard crystalline solid.
- Similar to PbSO4, it is known to be insoluble in water due to the strong ionic bonds that water cannot overcome.
- **Conclusion**: BaSO4 is not soluble in water.

### Final Answer:
The sulfates that are soluble in water are:
- CuSO4 (Copper(II) sulfate)
- Ag2SO4 (Silver sulfate)