Draw the structures of following acid.
(a)Marshall's acid

Answer

To draw the structure of Marshall's acid (peroxydisulfuric acid), follow these steps:

### Step-by-Step Solution:

1. **Identify the Chemical Formula**:
Marshall's acid is represented by the chemical formula H₂S₂O₈.

2. **Understand the Composition**:
The formula indicates that the molecule contains:
- 2 Hydrogen (H) atoms
- 2 Sulfur (S) atoms
- 8 Oxygen (O) atoms

3. **Recognize the Functional Groups**:
The name "peroxydisulfuric acid" suggests the presence of peroxy linkages (–O–O–) in addition to the sulfuric acid structure.

4. **Draw the Sulfur Backbone**:
Start by placing the two sulfur atoms (S) in the center. Each sulfur atom will be connected to oxygen atoms and will also have hydroxyl (–OH) groups.

5. **Add the Oxygen Atoms**:
- Each sulfur atom will be bonded to two oxygen atoms.
- One of the oxygen atoms will be part of a peroxy linkage (–O–O–) between the two sulfur atoms.

6. **Include the Hydroxyl Groups**:
- Attach one hydroxyl group (–OH) to each sulfur atom.

7. **Complete the Structure**:
- Ensure that the structure reflects the correct valency of each atom. Each sulfur atom should have a total of four bonds (considering the double bonds with oxygen and the single bonds with hydroxyl groups).

### Final Structure:
The final structure of Marshall's acid (H₂S₂O₈) can be depicted as follows:

```
O
||
HO-S-O-O-S-OH
||
O
```