Lead solution may be titrated with satndard ` EDTA` at `ph=6` using which indicator ?

Options

A. Methylnthymol blue
B. Eriochrome Bloack `T`
C. Methyl orange
D. Eosion

Answer

To determine which indicator can be used for titrating lead solution with standard EDTA at pH 6, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Titration Context**:
- We are performing a titration of lead ions (Pb²⁺) with EDTA (Ethylenediaminetetraacetic acid) at a specific pH of 6.

2. **Identify the pH Range**:
- The pH of 6 indicates a slightly acidic environment. We need to choose an indicator that is effective in this pH range.

3. **Select Suitable Indicators**:
- Indicators that are commonly used in titrations at pH 6 include Methyl Thymol Blue and others. However, we need to ensure that the indicator can also form a complex with the metal ion (lead in this case) and show a clear color change.

4. **Evaluate Methyl Thymol Blue**:
- Methyl Thymol Blue is known to change color around pH 6. It transitions from yellow to blue, which is suitable for detecting the endpoint in this titration.

5. **Conclusion**:
- Based on the analysis, the indicator that can be used for titrating lead solution with standard EDTA at pH 6 is **Methyl Thymol Blue**.

### Final Answer:
The indicator that can be used is **Methyl Thymol Blue**.

---