`BaSO_(4) darr+Na_(2)CO_(3) to BaCO_(3)darr+Na_(2)SO_(4)`

Options

A. For precipitate formation formation reaction
B. For precipitate dissolution reaction
C. For precipitate exchange reaction
D. For no reaction

Answer

To solve the given reaction \( \text{BaSO}_4 + \text{Na}_2\text{CO}_3 \rightarrow \text{BaCO}_3 + \text{Na}_2\text{SO}_4 \), we will analyze the reaction step by step.

### Step 1: Identify the Reactants and Products
The reactants in this reaction are:
- Barium sulfate (\( \text{BaSO}_4 \))
- Sodium carbonate (\( \text{Na}_2\text{CO}_3 \))

The products formed are:
- Barium carbonate (\( \text{BaCO}_3 \))
- Sodium sulfate (\( \text{Na}_2\text{SO}_4 \))

### Step 2: Determine the State of the Compounds
- \( \text{BaSO}_4 \) is a precipitate (indicated by the downward arrow).
- \( \text{Na}_2\text{CO}_3 \) is soluble in water.
- \( \text{BaCO}_3 \) is also a precipitate (indicated by the downward arrow).
- \( \text{Na}_2\text{SO}_4 \) is soluble in water.

### Step 3: Analyze the Reaction Type
This reaction involves the exchange of sulfate and carbonate ions between barium and sodium. Since both reactants and products contain precipitates, we can categorize this reaction based on the presence of precipitates.

### Step 4: Classify the Reaction
1. **Precipitate Formation Reaction**: This would apply if a precipitate formed from soluble reactants.
2. **Precipitate Dissolution Reaction**: This would apply if a precipitate dissolved to form soluble products.
3. **Precipitate Exchange Reaction**: This applies here, as both reactants and products contain precipitates, and they exchange components.
4. **No Reaction**: This does not apply since a reaction occurs.

### Conclusion
Since both \( \text{BaSO}_4 \) and \( \text{BaCO}_3 \) are precipitates and they share the common element barium (Ba), while the sulfate (SO4) and carbonate (CO3) ions are exchanged, this reaction is classified as a **precipitate exchange reaction**.

### Final Answer
The reaction \( \text{BaSO}_4 + \text{Na}_2\text{CO}_3 \rightarrow \text{BaCO}_3 + \text{Na}_2\text{SO}_4 \) is a **precipitate exchange reaction**.

---