Write the chemical formula for washing soda . How can it be obtained from baking soda ? Describe a houshold application of washing soda .

Explanation

### Step-by-Step Solution

1. **Chemical Formula for Washing Soda**:
- The chemical formula for washing soda is **Na₂CO₃·10H₂O**. This indicates that washing soda is sodium carbonate with ten molecules of water of crystallization.

2. **Obtaining Washing Soda from Baking Soda**:
- Baking soda is chemically known as **sodium bicarbonate (NaHCO₃)**.
- To obtain washing soda from baking soda, you need to heat baking soda. The reaction can be summarized as follows:
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