Temporary hardness of water can be removed by adding

Options

A. NaOH
B. `Na_(2)CO_(3)`
C. `Ca(OH)_(2)`
D. `MgCl_(2)`

Answer

To solve the question regarding the removal of temporary hardness of water, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Temporary Hardness**:
- Temporary hardness in water is primarily caused by the presence of bicarbonate salts of calcium (Ca(HCO₃)₂) and magnesium (Mg(HCO₃)₂).

2. **Identify the Method of Removal**:
- Temporary hardness can be removed by converting the soluble bicarbonates into insoluble carbonates. This is typically done using a chemical reaction.

3. **Chemical Reaction**:
- When calcium hydroxide (Ca(OH)₂) is added to water containing calcium bicarbonate, a reaction occurs:
\[ \text{Ca(HCO}_3\text{)}_2 + \text{Ca(OH)}_2 \rightarrow \text{CaCO}_3 \downarrow + 2\text{H}_2\text{O} \]
- In this reaction, calcium carbonate (CaCO₃) is formed, which is insoluble in water and precipitates out.

4. **Filtration**:
- The precipitated calcium carbonate can then be removed by filtration, leaving behind purified water.

5. **Conclusion**:
- Therefore, the addition of calcium hydroxide (Ca(OH)₂) effectively removes temporary hardness from water.

### Final Answer:
Temporary hardness of water can be removed by adding **Calcium Hydroxide (Ca(OH)₂)**.

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