`H_(3)PO_(3)` is diprotic (or dibasic). Why ?
Or What is the basicity of `H_(3)PO_(3)` and why ?

Explanation

To determine why \( H_3PO_3 \) is diprotic (or dibasic), we need to analyze its structure and the nature of its hydrogen atoms.

### Step 1: Understand the Structure of \( H_3PO_3 \)
- The molecular structure of phosphorous acid \( H_3PO_3 \) consists of one phosphorus atom (P) bonded to three hydroxyl groups (–OH) and one double-bonded oxygen (O).
- The chemical structure can be represented as:
\[ \text{H}_2\text{O} - \text{P} = \text{O} \]
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