Answer the following :
During Clark’s method. Name the compound in which Mg is precipitated out.

Answer

To answer the question regarding the compound in which magnesium is precipitated out during Clark's method, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Clark's Method**:
- Clark's method is a process used to remove hardness from water, specifically targeting calcium and magnesium ions.

2. **Identify the Reactants**:
- The main reactants in Clark's method are magnesium bicarbonate (Mg(HCO₃)₂) and calcium hydroxide (Ca(OH)₂).

3. **Chemical Reaction**:
- When magnesium bicarbonate reacts with calcium hydroxide, the following reaction occurs:
\[ Mg(HCO₃)₂ + Ca(OH)₂ \rightarrow MgCO₃ \downarrow + CaCO₃ \downarrow + H₂O \]
- In this reaction, magnesium carbonate (MgCO₃) is formed as a precipitate.

4. **Identify the Precipitate**:
- The precipitate formed from this reaction is magnesium carbonate (MgCO₃).

5. **Conclusion**:
- Therefore, during Clark's method, magnesium is precipitated out as magnesium carbonate (MgCO₃).

### Final Answer:
The compound in which magnesium is precipitated out during Clark's method is magnesium carbonate (MgCO₃).

---