Metaphosphoric acid is -

Foundation

Chemistry Foundation

Acid Base Indicators

Question

HPO₃

H₃PO₃

H₄P₂O₇

H₃PO₄

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Metaphosphoric acid is an inorganic acid with the formula HPO₃. It is a monobasic acid and a polymeric anhydride of orthophosphoric acid (H₃PO₄).

Its structure is a cyclic trimer: $H_{3} P_{3} O_{9}$ , but its simplest molecular formula is represented as HPO₃.

Final Answer: $H P O_{3}$