What happens when hydrate copper sulphate is heated ?

Options

A. it becomes colourless
B. it turns into anhydrous salt
C. it loses water of crystallization
D. all of the above

Explanation

### Step-by-Step Solution

1. **Understanding Hydrated Copper Sulfate**:
- Hydrated copper sulfate is represented by the chemical formula CuSO4·5H2O. This indicates that each formula unit of copper sulfate is associated with five molecules of water, known as water of crystallization.

2. **Color of Hydrated Copper Sulfate**:
- Hydrated copper sulfate is characterized by its blue color, which is due to the presence of water molecules in its crystalline structure.

3. **Heating Hydrated Copper Sulfate**:
- When hydrated copper sulfate is heated, the heat causes the water of crystallization (5H2O) to evaporate. As the water is lost, the compound undergoes a transformation.

4. **Formation of Copper Sulfate Monohydrate**:
- Initially, as heating begins, the compound loses some of its water, transitioning to copper sulfate monohydrate (CuSO4·H2O). The blue color starts to fade, indicating the loss of water.

5. **Formation of Anhydrous Copper Sulfate**:
- With continued heating, all the water of crystallization is removed, resulting in anhydrous copper sulfate (CuSO4). This form of copper sulfate is colorless or white.

6. **Final Observation**:
- The final product after complete heating is anhydrous copper sulfate, which does not contain any water of crystallization and is typically white in color.

### Summary of Changes:
- Hydrated Copper Sulfate (CuSO4·5H2O) → Heated → Copper Sulfate Monohydrate (CuSO4·H2O) → Further Heating → Anhydrous Copper Sulfate (CuSO4).