When is a precipitate formed when solutions of `BaCl_(2) and Na_(2)SO_(4)` are mixed ?

Explanation

To determine when a precipitate is formed when solutions of BaCl₂ and Na₂SO₄ are mixed, we can follow these steps:

### Step 1: Write the dissociation equations
When BaCl₂ and Na₂SO₄ are mixed, they dissociate into their respective ions in solution.

- **Dissociation of BaCl₂:**
\[
\text{BaCl}_2 \rightarrow \text{Ba}^{2+} + 2\text{Cl}^-
...