What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? State the physical conditions of reactants in which the reaction between them will not take place. Write the balanced chemical equation for the reaction and name the type of reaction.

Explanation

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactants in this reaction are sodium sulfate (Na₂SO₄) and barium chloride (BaCl₂). Both of these compounds are in aqueous solution.

2. **Write the Chemical Equation**: When sodium sulfate reacts with barium chloride, they undergo a double displacement reaction. The products of this reaction are barium sulfate (BaSO₄), which is a white precipitate, and sodium chloride (NaCl). The unbalanced equation is:
\[ \text{Na}_2\text{SO}_4 (aq) + \text{BaCl}_2 (aq) \rightarrow \text{BaSO}_4 (s) + \text{NaCl} (aq) \]
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