How would you prepare boric anhydride from boric acid ?

Explanation

To prepare boric anhydride (B2O3) from boric acid (H3BO3), follow these steps:

### Step 1: Heating Boric Acid
- **Action**: Heat boric acid (H3BO3) at a temperature of approximately 170°C.
- **Result**: This process results in the formation of metaboric acid (HBO2) and water (H2O).

### Step 2: Heating Metaboric Acid
- **Action**: Next, take the metaboric acid (HBO2) and heat it to around 330°C.
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