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
- Start with boric acid (H3BO3).
- Heat the boric acid at a temperature of about 100 degrees Celsius.

### Step 2: Formation of Metaboric Acid
- Upon heating, boric acid loses a molecule of water (H2O) and converts to metaboric acid (HBO2).
...