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It is a tribasic acid as all the three hydrogen atoms are ionisable. It forms three series of salts.

1. H₃PO₄ → H⁺ + H₂PO₄⁻
2. 3H⁺ + PO₄³⁻ → 2H⁺ + HPO₄²⁻
3. P₄O₁₀ + 2H₂O → 4HPO₃
4. 4HPO₃ + 2H₂O → 2H₄P₂O₇

Correct answer: 4HPO₃ + 2H₂O → 2H₄P₂O₇

Solution

This is the correct equation for the formation of a tribasic acid, where all three hydrogen atoms are ionizable.

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