`CaCl_(2)+Na_(2)SO_(4)toCaSO_(4)↓+2NaCl

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 question regarding the reaction between calcium chloride (CaCl₂) and sodium sulfate (Na₂SO₄), we will analyze the reaction step by step.

### Step-by-Step Solution:

1. **Identify the Reactants**:
The reactants in the equation are calcium chloride (CaCl₂) and sodium sulfate (Na₂SO₄).

2. **Write the Reaction**:
The reaction can be written as:
\[ \text{CaCl}_2 + \text{Na}_2\text{SO}_4 \rightarrow \text{CaSO}_4 + 2\text{NaCl} \]

3. **Check for Precipitate Formation**:
In this reaction, we need to determine if any of the products form a precipitate. Calcium sulfate (CaSO₄) is known to be slightly soluble in water, but it can precipitate under certain conditions.

4. **Analyze the Products**:
The products of the reaction are calcium sulfate (CaSO₄) and sodium chloride (NaCl). Sodium chloride is soluble in water, while calcium sulfate can form a precipitate if the concentration is high enough.

5. **Determine the Reaction Type**:
Since calcium sulfate can precipitate out of solution, this reaction can be classified as a **precipitation reaction**.

6. **Conclusion**:
The correct classification of the reaction is that it is a **precipitate formation reaction** because a solid (precipitate) is formed from the reactants.

### Final Answer:
The reaction \( \text{CaCl}_2 + \text{Na}_2\text{SO}_4 \rightarrow \text{CaSO}_4 \downarrow + 2\text{NaCl} \) is a **precipitate formation reaction**.

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