Give one method of preparation of `Na_(2)B_(4)O_(7)`

Explanation

To prepare sodium tetraborate (Na₂B₄O₇), commonly known as borax, we can follow a specific chemical reaction involving boric acid and sodium carbonate. Here’s a step-by-step breakdown of the preparation method:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The two main reactants needed for the preparation of sodium tetraborate are boric acid (H₃BO₃) and sodium carbonate (Na₂CO₃).

2. **Determine the Stoichiometry**:
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